[gentoo-user] CHOST question.
Morning... A small question to satisfy my curiosity about the CHOST setting in /etc/make.conf... Currently I have CHOST=i686-pc-linux-gnu on a computer with a pentium4 processor. Would it make any differences, at all, to change this to CHOST=pentium4-pc-linux-gnu ? Would the compiler then be optimized for the pentium4 and thus run a tad bit faster? Thank you, in advance P.S. Please don't warn me about changing chost, I've been through it before.:') -- From the Desk of: Jerome D. McBride -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] CHOST question.
Hi, no, it would not. gcc would simply refuse to work, because CHOST=pentium4-pc-linux-gnu is not a valid CHOST. CHOST describes the platform you build on. For optimizations take a look at CFLAGS. And by the way: Changing CHOST is not worth the trouble. Even if it would be possible in your case, it would be better to do a new install. It's faster (because when you change CHOST, you should at least run emerge -e system emerge -e world) and less likely to break. -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] CHOST question.
On Tuesday 05 February 2008 09:18:17 am Benedikt Morbach wrote: Hi, no, it would not. gcc would simply refuse to work, because CHOST=pentium4-pc-linux-gnu is not a valid CHOST. CHOST describes the platform you build on. For optimizations take a look at CFLAGS. Where do I find a list of valid chosts? I've been digging since my first post and the Gentoo Handbook on this page says: http://www.gentoo.org/doc/en/handbook/draft/complete/handbook.xml?part=2chap=5 QUOTE # info gcc Select GCC Command Options, Submodel Options, and pick your architecture. UNQUOTE On the submodel page for i386, it clearly lists the pentium4... My question is, what difference in performance would this change make? Thank you, for the post. -- From the Desk of: Jerome D. McBride -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] CHOST question.
On Tuesday 05 February 2008, Jerry McBride wrote: Would the compiler then be optimized for the pentium4 and thus run a tad bit faster? See Benedikt's answer for why you should not go down this road. If you did get it all to work right, and suffered through the emerge -e world required, your computer would in fact run a tiny tad faster, where tad is defined is a teensy weensy little bit, so small you can hardly see it with a magnifying glass Not worth the effort IMHO. Of course, there are ricers out there that will swear by it and declare that their machine runs much faster, but very few if any of them ever produce some actual numbers... -- Alan McKinnon alan dot mckinnon at gmail dot com -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] CHOST question.
On Tuesday 05 February 2008 10:35:34 am Alan McKinnon wrote: On Tuesday 05 February 2008, Jerry McBride wrote: Should be interesting... It'll lay to rest what everyone speculates or postulates. :') No need. Been done. Question answered long ago. You are beating a dead horse. We already know *exactly* what difference it makes - precious little. You want a machine that performs better? Stick in a disk drive with more cache memory. Instant improvement that will dwarf any change you could ever make with the compiler. Ever wondered why Ubuntu distributes 386 generic code? Because it makes no discernible difference whatsoever. But if you wanna go ahead and prove to yourself something that the toolchain world has know for like forever, then go ahead, don't let me stop you shrug -- Alan McKinnon alan dot mckinnon at gmail dot com Are the numbers posted somewhere I can get to? It'd be good reading. -- From the Desk of: Jerome D. McBride -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] CHOST question.
On Tuesday 05 February 2008, Jerry McBride wrote: Should be interesting... It'll lay to rest what everyone speculates or postulates. :') No need. Been done. Question answered long ago. You are beating a dead horse. We already know *exactly* what difference it makes - precious little. You want a machine that performs better? Stick in a disk drive with more cache memory. Instant improvement that will dwarf any change you could ever make with the compiler. Ever wondered why Ubuntu distributes 386 generic code? Because it makes no discernible difference whatsoever. But if you wanna go ahead and prove to yourself something that the toolchain world has know for like forever, then go ahead, don't let me stop you shrug -- Alan McKinnon alan dot mckinnon at gmail dot com -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] CHOST question.
Jerry McBride wrote: On Tuesday 05 February 2008 09:40:30 am Alan McKinnon wrote: On Tuesday 05 February 2008, Jerry McBride wrote: Would the compiler then be optimized for the pentium4 and thus run a tad bit faster? See Benedikt's answer for why you should not go down this road. If you did get it all to work right, and suffered through the emerge -e world required, your computer would in fact run a tiny tad faster, where tad is defined is a teensy weensy little bit, so small you can hardly see it with a magnifying glass Not worth the effort IMHO. Of course, there are ricers out there that will swear by it and declare that their machine runs much faster, but very few if any of them ever produce some actual numbers... Thanks for the post. I actually started working on this project late last night... My target test machine is an getting old Compaq R3000 with a 3ghz P4. What I'm going to do is just what you suggested. First I'm going to finish freshening the laptop. This is my daily hack-n-slash computer, so no worries clobbering it. I'm near the end of finishing an emerge -e world that was preceded with two rounds of emerge -e system Next step is some exhaustive bench marking. All suggestions welcomed. Then once completed, I'' make the change to chost from i686 to pentium4, following the docs on the net. Once done and smoothed out... another freshening as mentioned above, followed up with identical runs of what ever benchmarks I ran before... Should be interesting... It'll lay to rest what everyone speculates or postulates. :') Cheers. There is a script that will take care of the emerge and you only have to do it once. It's on the forums but I still have a copy if you want me to email it to you. Dale :-) :-) -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] CHOST question.
On Tuesday 05 February 2008 09:40:30 am Alan McKinnon wrote: On Tuesday 05 February 2008, Jerry McBride wrote: Would the compiler then be optimized for the pentium4 and thus run a tad bit faster? See Benedikt's answer for why you should not go down this road. If you did get it all to work right, and suffered through the emerge -e world required, your computer would in fact run a tiny tad faster, where tad is defined is a teensy weensy little bit, so small you can hardly see it with a magnifying glass Not worth the effort IMHO. Of course, there are ricers out there that will swear by it and declare that their machine runs much faster, but very few if any of them ever produce some actual numbers... Thanks for the post. I actually started working on this project late last night... My target test machine is an getting old Compaq R3000 with a 3ghz P4. What I'm going to do is just what you suggested. First I'm going to finish freshening the laptop. This is my daily hack-n-slash computer, so no worries clobbering it. I'm near the end of finishing an emerge -e world that was preceded with two rounds of emerge -e system Next step is some exhaustive bench marking. All suggestions welcomed. Then once completed, I'' make the change to chost from i686 to pentium4, following the docs on the net. Once done and smoothed out... another freshening as mentioned above, followed up with identical runs of what ever benchmarks I ran before... Should be interesting... It'll lay to rest what everyone speculates or postulates. :') Cheers. -- From the Desk of: Jerome D. McBride -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] CHOST question.
Benedikt Morbach [EMAIL PROTECTED] writes: Hi, no, it would not. gcc would simply refuse to work, because CHOST=pentium4-pc-linux-gnu is not a valid CHOST. CHOST describes the platform you build on. For optimizations take a look at CFLAGS. Though looking at /usr/share/gnuconfig/config.sub it looks as though it might be valid, and be canonicalized to 'i786-pc-linux-gnu' (rather than the more common i686-pc-linux-gnu) -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] CHOST question.
On Tuesday 05 February 2008 10:28:01 am Dale wrote: Jerry McBride wrote: On Tuesday 05 February 2008 09:40:30 am Alan McKinnon wrote: On Tuesday 05 February 2008, Jerry McBride wrote: Would the compiler then be optimized for the pentium4 and thus run a tad bit faster? See Benedikt's answer for why you should not go down this road. If you did get it all to work right, and suffered through the emerge -e world required, your computer would in fact run a tiny tad faster, where tad is defined is a teensy weensy little bit, so small you can hardly see it with a magnifying glass Not worth the effort IMHO. Of course, there are ricers out there that will swear by it and declare that their machine runs much faster, but very few if any of them ever produce some actual numbers... Thanks for the post. I actually started working on this project late last night... My target test machine is an getting old Compaq R3000 with a 3ghz P4. What I'm going to do is just what you suggested. First I'm going to finish freshening the laptop. This is my daily hack-n-slash computer, so no worries clobbering it. I'm near the end of finishing an emerge -e world that was preceded with two rounds of emerge -e system Next step is some exhaustive bench marking. All suggestions welcomed. Then once completed, I'' make the change to chost from i686 to pentium4, following the docs on the net. Once done and smoothed out... another freshening as mentioned above, followed up with identical runs of what ever benchmarks I ran before... Should be interesting... It'll lay to rest what everyone speculates or postulates. :') Cheers. There is a script that will take care of the emerge and you only have to do it once. It's on the forums but I still have a copy if you want me to email it to you. Dale :-) :-) Thanks for the offer. I'm almost finished the re-compiling stuff however. Why not post the script anyways? Someone else may be doing the same thing. Cheers. -- From the Desk of: Jerome D. McBride -- gentoo-user@lists.gentoo.org mailing list
Re: [gentoo-user] CHOST question.
Jerry McBride wrote: Thanks for the offer. I'm almost finished the re-compiling stuff however. Why not post the script anyways? Someone else may be doing the same thing. Cheers. It is attached. It's been around a while so I assume it still works. I put mine in the /root directory and you also need to be in the directory when you run it. It does some sort of extraction thing. It puts it where ever you are when you run it. Dale :-) :-) genscript.sh Description: Bourne shell script
Re: [gentoo-user] CHOST question.
On Tuesday 05 February 2008, Jerry McBride wrote: Are the numbers posted somewhere I can get to? It'd be good reading. Google knows where they are. -- Alan McKinnon alan dot mckinnon at gmail dot com -- gentoo-user@lists.gentoo.org mailing list
