Re: Why not using global variables considered thread-safe ?
On Wed, Nov 03, 2004, Dvir Volk wrote about Re: Why not using global variables considered thread-safe ?: On a 1-CPU machine, when you have global variables such as ints or floats, isn't reading and writing them atomic, and needs no locking? what are the general rules this issue? This is a complicated issue, and depends on the details of the CPU (i.e., different in different CPUs) and how it implements different C instructions that you consider reading and writing. For example, what happens when you do var += 3? Is this reading and writing and therefore don't need locking? Of course not: A certain CPU's assembly language might look something like load var/* load var into register */ add 3 /* add 3 to the register */ store var /* store back into var */ A context switch, even on a one CPU machine, might occur in the middle of this process, e.g., just before the store var, and cause a modification of the same var in a different thread to be lost when we return to this thread and finally do this store var. C Instructions which happen to be one machine instruction on your CPU, e.g., var++ or var=3, *are* guaranteed to be ok on a one-CPU machine. But even those things are *not* guaranteed to be ok on an SMP (multi-CPU) machine. Linux has an include file, atomic.h, which guarantees various atomic operations which will work correctly even on SMP machines. -- Nadav Har'El| Wednesday, Nov 3 2004, 19 Heshvan 5765 [EMAIL PROTECTED] |- Phone +972-523-790466, ICQ 13349191 |Arguing with nyh just doesn't pay off. http://nadav.harel.org.il |-- Muli Ben-Yehuda, Linux-il list = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: Why not using global variables considered thread-safe ?
On Wed, Nov 03, 2004, Oleg Goldshmidt wrote about Re: Why not using global variables considered thread-safe ?: On a 1-CPU machine, when you have global variables such as ints or floats, isn't reading and writing them atomic, and needs no locking? Absolutely not! 1) It is not just reading and writing. Consider, say, incrementing a global variable. It involves a number of operations: fetch from memory into a register, add 1, write back into memory. If there is a context switch in between you are in trouble. 2) What if your memory bus has width less than the width of int? Even reads and writes will not be atomic. Now, how wide are your floats? The latter is a problem on SMPs, but not on single-CPU machines; Context switches are guarenteed to happen after complete machine instructions are complete and the instruction and data queues are completely drained - and not while machine instructions are still in the middle of being processed. Of course, some hypothetical machines might have types that do not have machine instructions to handle them - e.g., a hypothetical machine might not have a single machine instruction to write to a 64-bit double, and you need two 32-bit instructions to do that. In that case, you are right. But I am not aware of any modern CPU that has such an issue. -- Nadav Har'El| Wednesday, Nov 3 2004, 19 Heshvan 5765 [EMAIL PROTECTED] |- Phone +972-523-790466, ICQ 13349191 |I couldn't afford a cool signature, so I http://nadav.harel.org.il |just got this one. = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: Who wants the admin password for the OpenSVN linuxisrael repository?
On Tuesday 02 November 2004 18:08, you wrote: Hi all! I opened a repository at opensvn.csie.org for Israeli Linux activities. At the moment I'm the only one who has the admin password, but I wish that at least someone else will have it as well. So if you want it please say so. The repository root is: http://opensvn.csie.org/linuxisrael/ And managing it is done from: https://opensvn.csie.org/ OK, just a few clarifications. This is a Subversion[1] repository, where Subversion is a version control tool similar to CVS (only much better). It is hosted at opensvn.csie.org, and managed there. I need someone to be able to co-admin the repository - add users, change passwords, etc, and for that I need to give someone the admin password. Regards, Shlomi Fish [1] - http://subversion.tigris.org/ Regards, Shlomi Fish -- - Shlomi Fish [EMAIL PROTECTED] Homepage:http://www.shlomifish.org/ Knuth is not God! It took him two days to build the Roman Empire. = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: Why not using global variables considered thread-safe ?
Nadav Har'El [EMAIL PROTECTED] writes: On Wed, Nov 03, 2004, Oleg Goldshmidt wrote about Re: Why not using global variables considered thread-safe ?: On a 1-CPU machine, when you have global variables such as ints or floats, isn't reading and writing them atomic, and needs no locking? Absolutely not! 1) It is not just reading and writing. Consider, say, incrementing a global variable. It involves a number of operations: fetch from memory into a register, add 1, write back into memory. If there is a context switch in between you are in trouble. 2) What if your memory bus has width less than the width of int? Even reads and writes will not be atomic. Now, how wide are your floats? The latter is a problem on SMPs, but not on single-CPU machines; Context switches are guarenteed to happen after complete machine instructions are complete and the instruction and data queues are completely drained - and not while machine instructions are still in the middle of being processed. Of course, some hypothetical machines might have types that do not have machine instructions to handle them - e.g., a hypothetical machine might not have a single machine instruction to write to a 64-bit double, and you need two 32-bit instructions to do that. In that case, you are right. But I am not aware of any modern CPU that has such an issue. Nadav, You may be right - I cannot make a definite statement without checking further. However, I have a suspicion that while your statement may be correct for normal types of CPUs and maybe even is part of POSIX or some other standard, it is not universal. *Possible* exceptions may include wide types [1], process architectures that do not guarantee word-alignment [2], and other pathologies. [1] even primitive types wider than int, such as long and double; AFAIK Java manuals specifically warn that there is no atomic access to longs and doubles unless you declare them volatile. [2] yes, there are some, your ints may be not word-aligned -- Oleg Goldshmidt | [EMAIL PROTECTED] = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: Who wants the admin password for the OpenSVN linuxisrael repository?
I might have a use for such a server for a project I'd like to share on the net (a-la sourceforge but with SVN). A tcptraceroute shows that it's located in Taiwan. Is it a reliable server with reliable conneciton? Is it praticle to relay on it? Thanks, --Amos Shlomi Fish wrote: On Tuesday 02 November 2004 18:08, you wrote: Hi all! I opened a repository at opensvn.csie.org for Israeli Linux activities. At the moment I'm the only one who has the admin password, but I wish that at least someone else will have it as well. So if you want it please say so. The repository root is: http://opensvn.csie.org/linuxisrael/ And managing it is done from: https://opensvn.csie.org/ OK, just a few clarifications. This is a Subversion[1] repository, where Subversion is a version control tool similar to CVS (only much better). It is hosted at opensvn.csie.org, and managed there. I need someone to be able to co-admin the repository - add users, change passwords, etc, and for that I need to give someone the admin password. Regards, Shlomi Fish [1] - http://subversion.tigris.org/ Regards, Shlomi Fish = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: max user processes
On 02 Nov 2004 11:06:12 +, Oleg Goldshmidt [EMAIL PROTECTED] wrote: Ben-Nes Michael [EMAIL PROTECTED] writes: Hi All how do i raise the parameter of max user processes ? # ulimit -a max user processes(-u) 256 setrlimit(2) How do I make it a default value when OS boot ? ( i mean not thrugh rc.local / rc.boot ... ) ulimit -u 512 = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: Why not using global variables considered thread-safe ?
Oleg Goldshmidt wrote: [1] even primitive types wider than int, such as long and double; AFAIK Java manuals specifically warn that there is no atomic access to longs and doubles unless you declare them volatile. On the 68000 all datatypes are 8, 16 or 32 bits wide. The actual bus, however, is only 16 bits wide. Even a simple 32 bit integer (natively supported by the CPU) does not guarantee atomicness. [2] yes, there are some, your ints may be not word-aligned Well, if you just compiled them, they are pretty sure to be ok. If you got them through a pointer, however, they may be unaligned (depending on who generated them). Intel doesn't enforce integral boundaries. Motorola 68000 did, but only on 16 bit boundaries (because that was it's bus width). Then 68020 had 32 bit bus, and it had to be ok with non-aligned integers or programs written for the 68000 wouldn't work, so it stopped enforcing them as well. As an Amiga owner, I had problems with programs written for 68020 trying to access 16 bit values on 8 bit boundaries, which would work on 68020 but not on 68000. Guru meditation 8003 - CPU unaligned access error. Shachar -- Shachar Shemesh Lingnu Open Source Consulting ltd. http://www.lingnu.com/ = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: Why not using global variables considered thread-safe ?
On Wed, Nov 03, 2004, Shachar Shemesh wrote about Re: Why not using global variables considered thread-safe ?: Oleg Goldshmidt wrote: [1] even primitive types wider than int, such as long and double; AFAIK Java manuals specifically warn that there is no atomic access to longs and doubles unless you declare them volatile. On the 68000 all datatypes are 8, 16 or 32 bits wide. The actual bus, however, is only 16 bits wide. Even a simple 32 bit integer (natively supported by the CPU) does not guarantee atomicness. Again, I believe you're mixing in issues which are relevant on SMPs, but not on a single-CPU machine (which was the topic of this discussion). The bus might be even 1-bit wide for all I care, but when a single machine instruction completes (or, on pipelined architechture, which the pipeline is empty), all the relevant data was already moved on the bus. When a single-CPU machine does a context switch, it doesn't do it in the middle of a machine instruction, it does it afterwards. So this is *not* a problem if 32 bit integers are natively supported by the CPU (i.e., there are machine instructions which operate on them) like you said. But, like I mentioned, there might be hypothetical machines which don't have any 32 bit (or 64 bit, or whatever) instructions, and when you write double d=0.0; in C, which actually gets done in machine language are two instructions which separately set the two halfs of the data. In such a case, indeed a context switch might happen between the two halfs. But, like I said, I don't know of any modern CPU on which this happens for C's usual types (long, double, etc.). Anyway, this problem - related to bus widths and cache-line lengths, is indeed very real on SMP machines (though, if I remember correctly, they aren't a problem on Pentium SMPs). -- Nadav Har'El| Wednesday, Nov 3 2004, 19 Heshvan 5765 [EMAIL PROTECTED] |- Phone +972-523-790466, ICQ 13349191 |In case of emergency, this box may be http://nadav.harel.org.il |used as a quotation device. = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: max user processes
Ben-Nes Michael [EMAIL PROTECTED] writes: On 02 Nov 2004 11:06:12 +, Oleg Goldshmidt [EMAIL PROTECTED] wrote: Ben-Nes Michael [EMAIL PROTECTED] writes: Hi All how do i raise the parameter of max user processes ? # ulimit -a max user processes(-u) 256 setrlimit(2) How do I make it a default value when OS boot ? ( i mean not thrugh rc.local / rc.boot ... ) Recompile the kernel? Can you explain why rc.local (and by extension anything within initscripts, I presume) is not acceptable? After all, it is a part of the normal boot process. Whatever interface or configuration file - if any - you will use will be invoked (or read) at the init stage, I think. Normally, ulimit is invoked by /etc/profile and the equivalent, but I suppose you will consider it too late. If your system uses pam, maybe looking at /etc/security/limits.conf will help. -- Oleg Goldshmidt | [EMAIL PROTECTED] = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: Why not using global variables considered thread-safe ?
Nadav Har'El wrote: When a single-CPU machine does a context switch, it doesn't do it in the middle of a machine instruction, it does it afterwards. This sentance is not universally true, though I don't have details of contradicting examples on hand. Yes, astonishing as it may sound, some CPUs save their internal state on interrupt, and resume mid-operation. That is, unless my memory is playing tricks of me (which is not impossible). But, like I mentioned, there might be hypothetical machines which don't have any 32 bit (or 64 bit, or whatever) instructions, and when you write double d=0.0; in C, which actually gets done in machine language are two instructions which separately set the two halfs of the data. In such a case, indeed a context switch might happen between the two halfs. But, like I said, I don't know of any modern CPU on which this happens for C's usual types (long, double, etc.). Anyway, this problem - related to bus widths and cache-line lengths, is indeed very real on SMP machines (though, if I remember correctly, they aren't a problem on Pentium SMPs). -- Shachar Shemesh Lingnu Open Source Consulting ltd. http://www.lingnu.com/ = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: Why not using global variables considered thread-safe ?
Here is another potential issue: http://www.lambdacs.com/cpt/MFAQ.html#Q156 In any case, the whole point is moot: one should *never* write code that will only execute correctly on a single-CPU system and break on SMP. -- Oleg Goldshmidt | [EMAIL PROTECTED] = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: Why not using global variables considered thread-safe ?
On Wed, 3 Nov 2004, Shachar Shemesh wrote: Nadav Har'El wrote: When a single-CPU machine does a context switch, it doesn't do it in the middle of a machine instruction, it does it afterwards. This sentance is not universally true, though I don't have details of contradicting examples on hand. Yes, astonishing as it may sound, some CPUs save their internal state on interrupt, and resume mid-operation. That is, unless my memory is playing tricks of me (which is not impossible). Example which comes to my mind: 80x86 string operations with the rep prefix. Those string operations modify SI, DI and memory. When context switch occurs and the operation is restarted, it is restarted with the current values of SI and DI. --- Omer My opinions, as expressed in this E-mail message, are mine alone. They do not represent the official policy of any organization with which I may be affiliated in any way. WARNING TO SPAMMERS: at http://www.zak.co.il/spamwarning.html = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: max user processes
On Wed, Nov 03, 2004 at 01:43:46PM +0300, Ben-Nes Michael wrote: On 02 Nov 2004 11:06:12 +, Oleg Goldshmidt [EMAIL PROTECTED] wrote: Ben-Nes Michael [EMAIL PROTECTED] writes: Hi All how do i raise the parameter of max user processes ? # ulimit -a max user processes(-u) 256 setrlimit(2) How do I make it a default value when OS boot ? ( i mean not thrugh rc.local / rc.boot ... ) One way is through /etc/initscript - read init(1). You might also want to use pam_limits through /etc/security/limits.conf. -- Didi = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
AS or ES, is there a difference or is it BS?
Hello friends. Today I have a question on proprietery software, namely Red Hat. I'm in Turkey, installing an Oracle RAC cluster on two Red Hat machines. the guy ordered RHEL 3 AS but until it arrives in the mail (Dell does not support Emailing licence keys) I installed it on 3 ES because those were the medias I could find, having no RHN password of my own. now here is the question. is the AS kernel really better? the only hint I could get as to what the differences were was not burried even at the deepest marketing piles on the redhat.com site, but in an independant guide about optimizing oracle. this paragraph talkes about RHAS 2.1 aactually, but is it true also for RHAS 3? http://www.puschitz.com/TuningLinuxForOracle.shtml#WhyUsingRedHatAdvancedServer any opinions and testaments are welcome. also advice about whether Oracle enjoys or suffers from hyperthreading. Thanks, Ira. -- Super fly Ira Abramov http://ira.abramov.org/email/ = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
messages disappearing from hamakor linux-il archives
Who is maintaining the linux-il archives at Hamakor? Some messages have only This message has been deleted from the archive in the body. Examples from today's thread: http://mirror.hamakor.org.il/archives/linux-il/11-2004/12456.html http://mirror.hamakor.org.il/archives/linux-il/11-2004/12459.html These messages do not appear in the thread view in http://mirror.hamakor.org.il/archives/linux-il/11-2004/index.html At least this is the case for me (Mozilla on RH9). What gives? A bug in hypermail? By the way, is there any way to search the archives? -- Oleg Goldshmidt | [EMAIL PROTECTED] = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: messages disappearing from hamakor linux-il archives
By the way, is there any way to search the archives? There is another mirror for linux-il as linked by IGLU, it also has a search function (quite useful too) :) http://www.mail-archive.com/[EMAIL PROTECTED]/ On 03 Nov 2004 16:01:49 +, Oleg Goldshmidt [EMAIL PROTECTED] wrote: Who is maintaining the linux-il archives at Hamakor? Some messages have only This message has been deleted from the archive in the body. Examples from today's thread: http://mirror.hamakor.org.il/archives/linux-il/11-2004/12456.html http://mirror.hamakor.org.il/archives/linux-il/11-2004/12459.html These messages do not appear in the thread view in http://mirror.hamakor.org.il/archives/linux-il/11-2004/index.html At least this is the case for me (Mozilla on RH9). What gives? A bug in hypermail? By the way, is there any way to search the archives? -- Oleg Goldshmidt | [EMAIL PROTECTED] = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED] -- Maxim Vexler (hq4ever). [CODE] for i in `..::LINUX::..`; do $i CHANGE THE WORLD; done [/CODE] = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
messages disappearing from hamakor linux-il archives
Who is maintaining the linux-il archives at Hamakor? Some messages have only This message has been deleted from the archive in the body. Examples from today's thread: http://mirror.hamakor.org.il/archives/linux-il/11-2004/12456.html http://mirror.hamakor.org.il/archives/linux-il/11-2004/12459.html These messages do not appear in the thread view in http://mirror.hamakor.org.il/archives/linux-il/11-2004/index.html At least this is the case for me (Mozilla on RH9). What gives? A bug in hypermail? By the way, is there any way to search the archives? -- Oleg Goldshmidt | [EMAIL PROTECTED] = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
RE: Why not using global variables considered thread-safe ?
Title: RE: Why not using global variables considered thread-safe ? There are test-and-set instructions for example : 68000 has tas, SPARC has ldstub etc. Upon return the value is set to the address. The return value varies - if the value really changes or not. Keep in mind that application for the common desktop could safely assume one CPU but Intel's hyper threading technology break that founding. Global variables are no option at all as I see it. If a common counter is needed (to indicate a change) a counting semaphore can be used. Regards, Iftach This e-mail message has been sent by Elbit Systems Ltd. and is for the use of the intended recipients only.The message may containprivileged or commercial confidential information .If you are not the intended recipient you are hereby notified that any use,distribution or copying of this communication is strictly prohibited,and you are requested to delete the e-mail and any attachments and notify the sender immediately.
Re: messages disappearing from hamakor linux-il archives
Maxim Vexler [EMAIL PROTECTED] writes: By the way, is there any way to search the archives? There is another mirror for linux-il as linked by IGLU, it also has a search function (quite useful too) :) http://www.mail-archive.com/[EMAIL PROTECTED]/ Thanks. The missing message problem exists there as well: e.g. http://www.mail-archive.com/[EMAIL PROTECTED]/msg36756.html is followed by http://www.mail-archive.com/[EMAIL PROTECTED]/msg36758.html (i.e. msg36757 is missing). -- Oleg Goldshmidt | [EMAIL PROTECTED] = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: Why not using global variables considered thread-safe ?
Hyams Iftach [EMAIL PROTECTED] writes: There are test-and-set instructions Those are normally atomic - that's their whole point, isn't it? Keep in mind that application for the common desktop could safely assume one CPU but Intel's hyper threading technology break that founding. The OS (and everything above) sees a hyperthreaded processor as SMP. Try to install a Linux distro such as Red Hat (Enterprise or Fedora) on a UP Xeon machine - it will pick an SMP kernel, with good reason. So will Windows. But let me repeat what I wrote earlier: you can *never* assume one CPU, with or without hyperthreading. Code that does not work properly on SMP is *broken*, for the simple reason that someone, somewhere, *will* try to run it on SMP. And that will lead to a major, prolonged headache. -- Oleg Goldshmidt | [EMAIL PROTECTED] = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: AS or ES, is there a difference or is it BS?
On Wed, Nov 03, 2004 at 03:12:59PM +0200, Ira Abramov wrote: Hello friends. Today I have a question on proprietery software, namely Red Hat. I'm in Turkey, installing an Oracle RAC cluster on two Red Hat machines. the guy ordered RHEL 3 AS but until it arrives in the mail (Dell does not support Emailing licence keys) I installed it on 3 ES because those were the medias I could find, having no RHN password of my own. What about RHEL compatibles, such as Whitebox? Their system and kernel setting should be similar enough to RHEL . And AS and ES are exactly the same, AFAIK. And you personally don't need any RHN password. -- Tzafrir Cohen +---+ http://www.technion.ac.il/~tzafrir/ |vim is a mutt's best friend| mailto:[EMAIL PROTECTED] +---+ = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: AS or ES, is there a difference or is it BS?
Well AS ES WS segmentation is mainly a marketing issue. AS simply has more packages in them but if you check you'll see that they'll work on an ES or WS as well. They share the same kenel rpms. These are the kernels in AS3 and ES3: kernel-2.4.21-4.EL+1065219896.i686.rpm kernel-BOOT-2.4.21-4.EL+1065217513.i386.rpm kernel-hugemem-2.4.21-4.EL+1065219896.i686.rpm kernel-hugemem-unsupported-2.4.21-4.EL+1065219896.i686.rpm kernel-pcmcia-cs-3.1.31-13+1043502449.i386.rpm kernel-smp-2.4.21-4.EL+1065219896.i686.rpm kernel-smp-unsupported-2.4.21-4.EL+1065219896.i686.rpm kernel-source-2.4.21-4.EL+1065217513.i386.rpm kernel-unsupported-2.4.21-4.EL+1065219896.i686.rpm kernel-utils-2.4-8.37+1063024494.i386.rpm If you look at http://www.redhat.com/software/rhel/comparison/ You can see that actually the only difference is S390 (mainframe) support for the AS3 and the last line there claims that es is limited to - 32-bit systems: 8GB 64-bit systems: 16GB memory support in the kernel. Now if it's the same kernel that means that either they install a different default kernel or there's some magic done in anaconda that may send different things to init. Bothe of them have kernel-hugemem so I don't understand how they create this difference. Basicly the difference is in the level and possible scalability of support you recieve. Now although typical oracle installations can arrive to 8GB and more of memory if you're not surpassing that limit you have nothing to be concerned about. regards - Lior. On Wed, 3 Nov 2004 15:12:59 +0200, Ira Abramov [EMAIL PROTECTED] wrote: Hello friends. Today I have a question on proprietery software, namely Red Hat. I'm in Turkey, installing an Oracle RAC cluster on two Red Hat machines. the guy ordered RHEL 3 AS but until it arrives in the mail (Dell does not support Emailing licence keys) I installed it on 3 ES because those were the medias I could find, having no RHN password of my own. now here is the question. is the AS kernel really better? the only hint I could get as to what the differences were was not burried even at the deepest marketing piles on the redhat.com site, but in an independant guide about optimizing oracle. this paragraph talkes about RHAS 2.1 aactually, but is it true also for RHAS 3? http://www.puschitz.com/TuningLinuxForOracle.shtml#WhyUsingRedHatAdvancedServer any opinions and testaments are welcome. also advice about whether Oracle enjoys or suffers from hyperthreading. Thanks, Ira. -- Super fly Ira Abramov http://ira.abramov.org/email/ = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED] -- Peace Love and Penguins - Lior Kesos = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: messages disappearing from hamakor linux-il archives
Eran Tromer [EMAIL PROTECTED] writes: Rejoice! Hypermail is merely respecting an X-No-Archive: Yes header (unlike, for example, Uri Sharf's archive of [EMAIL PROTECTED] at linmagazine.co.il). Live and learn... I didn't know it existed. Shall I consider it a useful tip from a distinguished security expert? ;-) -- Oleg Goldshmidt | [EMAIL PROTECTED] = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: messages disappearing from hamakor linux-il archives
On Wed, Nov 03, 2004, Eran Tromer wrote about Re: messages disappearing from hamakor linux-il archives: On 11/03/2004 05:46 PM, Oleg Goldshmidt wrote: Who is maintaining the linux-il archives at Hamakor? Some messages have only This message has been deleted from the archive in the body. Rejoice! Hypermail is merely respecting an X-No-Archive: Yes header (unlike, for example, Uri Sharf's archive of [EMAIL PROTECTED] at linmagazine.co.il). I wonder why it should respect this sort of header. Using a mailing list is a bargain you make. You gain publicity to what you write, and for it you lose privacy. That's right: you can't have publicity *and* privacy at the same time, and usually the balance of privacy and publicity is determined by the mailing list and its subscribers, not by you. It's like those people who send mail to a mailing list with a footer saying this mail is confidential. That's non-sense - when you send a mail to a busy list, you should expect hundreds of people to read your mail today, dozens to read it tomorrow when they get to their computer, a few to read it next week when they have time, some people to save your message on their disk, and yes - some people also saving the message for posterity, and even sharing it with others later or shoving it in your face in 10 years. Why should a special header let you override this natural order? It obviously won't have any effects on your enemies, who can save your messages nontheless, so why should it effect your friends? -- Nadav Har'El| Wednesday, Nov 3 2004, 20 Heshvan 5765 [EMAIL PROTECTED] |- Phone +972-523-790466, ICQ 13349191 |Two wrongs may not may a right, but three http://nadav.harel.org.il |rights make a left. = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: messages disappearing from hamakor linux-il archives
On Wednesday, Nov 3, 2004, at 19:30 Asia/Jerusalem, Nadav Har'El wrote: I wonder why it should respect this sort of header. Using a mailing list is a bargain you make. You gain publicity to what you write, and for it you lose privacy. That's right: you can't have publicity *and* privacy at the same time, and usually the balance of privacy and publicity is determined by the mailing list and its subscribers, not by you. This would be the same as saying Publishing pages on a web site means you want to make them public so I shouldn't respect your robots.txt file. There are many reasons why people would not want to archive their messages. For example, if the message contains information which is transient - relevant now, but will become misleading tomorrow. Or when the message is off-topic and they see no value in it being retained. Herouth = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
adding bidi support
Hi all, I have been doing music notation with lilypond (www.lilypond.org) for a number of years. With the help of this group and ivrex as well as the lilypond users group I was able to acheive hebrew support for lilypond.http://www.geocities.com/aamehl/ However the effort is less than robust. Every time a new version of lilypond comes out the hebrew support is broken. The problem is that a scheme hacker on the lilypond list, hacked together some lilypond scheme stuff to get bidi to work. As lilypond's scheme stuff changes the hack no longer works. So my question: I would like a open/standard way of adding bidi support to lilypond so that I won't need scheme hacks. Is there a way to create my own customized lilypond that uses freebidi or some other tool? Thanks Aaron = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
Re: Bad sectors
Hello, The hangup is due to IDE device not returning answers (only seems there is an error notifications) and kernel having to wait for real error to come back. The IDE bus the device is connected to, is blocked as well (as not on FireWire or SCSI buses). You can use dd_rescue (with big fallback block to speed up recovery) to recover data, but you can't tell to CDROM to stop block reading attempts after some time. --- Bye, | Phone: (972)-2-6795364 Arieh | Fax: (972)-2-6796453 ik wrote: Hi list, I mounted a cdrom, and wanted to read it content, but the kernel reported about some bad sectors... The content of the cdrom are images, and i could not kill the imagemagic display program, nor umount the cdrom. And every action I did try to do, hand the system, until I exit the xserver and kill some processes and used the eject program as well. Is there a way to tell the kernel to stop reading the drives when it finds so many errors and so many problems ? If so, how can I do it ? Thank you for the help, Ido = To unsubscribe, send mail to [EMAIL PROTECTED] with the word unsubscribe in the message body, e.g., run the command echo unsubscribe | mail [EMAIL PROTECTED]
