Re: Slow on Linux
I have read that Suse linux team has been working closely with AMD to support AMD64, and I am going to try their commercial product (professional edition, $130). I know that SUN plan to have an AMD64 version for the JDK 1.5, which should be next year. The reason for choosing the Linux OS is not Java, but the database. I plan to use PostgreSQL 7.4, and they have a builds for suse x86_64, so it looks promising. Nikola Milutinovic wrote: Yonatan Goraly wrote: The exact execution time of that line of code is not very relevant, since the difference is between an interval I can't notice to an interval I can notice very well - should be at least a factor of x100. I just finished installing RedHat 9 (32 bit), the performance is much better, and the CPU is working much less. I guess it was something related to the Mandrake version I had. It still feels slower than what I am used to on Windows, but I have to make measurements in order to arrive at any conclusions. You're using Opteron - that is 64-bit CPU. Why not compile kernel from the source for your desired platform? Is there a JRE specifically for Opteron? Nix. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Slow on Linux
Yonatan Goraly wrote: I have read that Suse linux team has been working closely with AMD to support AMD64, and I am going to try their commercial product (professional edition, $130). I know that SUN plan to have an AMD64 version for the JDK 1.5, which should be next year. The reason for choosing the Linux OS is not Java, but the database. I plan to use PostgreSQL 7.4, and they have a builds for suse x86_64, so it looks promising. Mmmm, that makes me drool... Nix. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Slow on Linux
I imagine that you could compile an AMD64 kernel, and compile Postgresql for AMD64. But you still might have a poor performer with a 32-bit jdk. You could put Postgresql on a separate AMD64 server and Tomcat on a 32-bit X86 server, but that may or may not be what you want. Compiling a kernel for a server is really quite easy, because you don't need to worry about peripherials like FireWire, USB, etc. My HowTo describes how to compile PostgreSQL 7.3.4, and it's probably the same for 7.4. But I am going to compile 7.4 soon and post the info on my web page. Oscar http://daydream.stanford.edu/tomcat/install_web_services.html Yonatan Goraly wrote: I have read that Suse linux team has been working closely with AMD to support AMD64, and I am going to try their commercial product (professional edition, $130). I know that SUN plan to have an AMD64 version for the JDK 1.5, which should be next year. The reason for choosing the Linux OS is not Java, but the database. I plan to use PostgreSQL 7.4, and they have a builds for suse x86_64, so it looks promising. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Slow on Linux
Just wondering. Did you know that every Postgres connection creates a system process, and not a thread? PostgreSQL uses Fork. I don't use it because of this. DB Connection = Separate Process. I use Firebird. You can use Firebird 1.5 even. That's just a consideration since you are posting about performance. Wade -Original Message- From: Yonatan Goraly [mailto:[EMAIL PROTECTED] Sent: Tuesday, November 25, 2003 3:05 AM To: Tomcat Users List Subject: Re: Slow on Linux I have read that Suse linux team has been working closely with AMD to support AMD64, and I am going to try their commercial product (professional edition, $130). I know that SUN plan to have an AMD64 version for the JDK 1.5, which should be next year. The reason for choosing the Linux OS is not Java, but the database. I plan to use PostgreSQL 7.4, and they have a builds for suse x86_64, so it looks promising. Nikola Milutinovic wrote: Yonatan Goraly wrote: The exact execution time of that line of code is not very relevant, since the difference is between an interval I can't notice to an interval I can notice very well - should be at least a factor of x100. I just finished installing RedHat 9 (32 bit), the performance is much better, and the CPU is working much less. I guess it was something related to the Mandrake version I had. It still feels slower than what I am used to on Windows, but I have to make measurements in order to arrive at any conclusions. You're using Opteron - that is 64-bit CPU. Why not compile kernel from the source for your desired platform? Is there a JRE specifically for Opteron? Nix. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Slow on Linux
Isn't this what connection pooling is all about? Wade Chandler wrote: Just wondering. Did you know that every Postgres connection creates a system process, and not a thread? PostgreSQL uses Fork. I don't use it because of this. DB Connection = Separate Process. I use Firebird. You can use Firebird 1.5 even. That's just a consideration since you are posting about performance. Wade -Original Message- From: Yonatan Goraly [mailto:[EMAIL PROTECTED] Sent: Tuesday, November 25, 2003 3:05 AM To: Tomcat Users List Subject: Re: Slow on Linux I have read that Suse linux team has been working closely with AMD to support AMD64, and I am going to try their commercial product (professional edition, $130). I know that SUN plan to have an AMD64 version for the JDK 1.5, which should be next year. The reason for choosing the Linux OS is not Java, but the database. I plan to use PostgreSQL 7.4, and they have a builds for suse x86_64, so it looks promising. Nikola Milutinovic wrote: Yonatan Goraly wrote: The exact execution time of that line of code is not very relevant, since the difference is between an interval I can't notice to an interval I can notice very well - should be at least a factor of x100. I just finished installing RedHat 9 (32 bit), the performance is much better, and the CPU is working much less. I guess it was something related to the Mandrake version I had. It still feels slower than what I am used to on Windows, but I have to make measurements in order to arrive at any conclusions. You're using Opteron - that is 64-bit CPU. Why not compile kernel from the source for your desired platform? Is there a JRE specifically for Opteron? Nix. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Slow on Linux
Ok, I read the PostgreSQL docs. It looks like AMD64 version is only workable under kernel 2.6. The good thing about the new kernel 2.6 is that FWIK you can have as many process/threads as you want cause it handles order of magnitudes more than kernel 2.4. I would also watch blackdown.org release schedule for their 64-bit version of the jdk/jre. IMHO, they know Linux a lot better than the Sun group does and are less combative with Linux. IBM jdk/jre is one to watch too. Oscar On Tue, 25 Nov 2003, Oscar Carrillo wrote: I imagine that you could compile an AMD64 kernel, and compile Postgresql for AMD64. But you still might have a poor performer with a 32-bit jdk. You could put Postgresql on a separate AMD64 server and Tomcat on a 32-bit X86 server, but that may or may not be what you want. Compiling a kernel for a server is really quite easy, because you don't need to worry about peripherials like FireWire, USB, etc. My HowTo describes how to compile PostgreSQL 7.3.4, and it's probably the same for 7.4. But I am going to compile 7.4 soon and post the info on my web page. Oscar http://daydream.stanford.edu/tomcat/install_web_services.html Yonatan Goraly wrote: I have read that Suse linux team has been working closely with AMD to support AMD64, and I am going to try their commercial product (professional edition, $130). I know that SUN plan to have an AMD64 version for the JDK 1.5, which should be next year. The reason for choosing the Linux OS is not Java, but the database. I plan to use PostgreSQL 7.4, and they have a builds for suse x86_64, so it looks promising. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Slow on Linux
I assume Firebird is just doing connection pooling internally. To be fair though, it is supposed to have very good performance but without all the features of PostgreSQL. Oscar On Tue, 25 Nov 2003, Yonatan Goraly wrote: Isn't this what connection pooling is all about? Wade Chandler wrote: Just wondering. Did you know that every Postgres connection creates a system process, and not a thread? PostgreSQL uses Fork. I don't use it because of this. DB Connection = Separate Process. I use Firebird. You can use Firebird 1.5 even. That's just a consideration since you are posting about performance. Wade -Original Message- From: Yonatan Goraly [mailto:[EMAIL PROTECTED] Sent: Tuesday, November 25, 2003 3:05 AM To: Tomcat Users List Subject: Re: Slow on Linux I have read that Suse linux team has been working closely with AMD to support AMD64, and I am going to try their commercial product (professional edition, $130). I know that SUN plan to have an AMD64 version for the JDK 1.5, which should be next year. The reason for choosing the Linux OS is not Java, but the database. I plan to use PostgreSQL 7.4, and they have a builds for suse x86_64, so it looks promising. Nikola Milutinovic wrote: Yonatan Goraly wrote: The exact execution time of that line of code is not very relevant, since the difference is between an interval I can't notice to an interval I can notice very well - should be at least a factor of x100. I just finished installing RedHat 9 (32 bit), the performance is much better, and the CPU is working much less. I guess it was something related to the Mandrake version I had. It still feels slower than what I am used to on Windows, but I have to make measurements in order to arrive at any conclusions. You're using Opteron - that is 64-bit CPU. Why not compile kernel from the source for your desired platform? Is there a JRE specifically for Opteron? Nix. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Slow on Linux
Wade Chandler wrote: Just wondering. Did you know that every Postgres connection creates a system process, and not a thread? PostgreSQL uses Fork. I don't use it because of this. DB Connection = Separate Process. I use Firebird. You can use Firebird 1.5 even. That's just a consideration since you are posting about performance. AFAIK, a process and a thread look similar to the CPU. They are both tasks, it is just that threads share the same memory table descriptor and some other things. Sure, creating a new process implies separate copies of stack and data segments, but with CoW (Copy-on-Write) mechanism, it can save a lot of copying. I wouldn't bet on a very high performance gain, unless the problem is more suited for the multi-threaded model (concurent tasks need a tight coupling). Is DB backend this kind of problem? It could be... Nix. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Slow on Linux
I'm no expert on Servlets so I'm not sure what's involved with all those calls, but it doesn't seem like it could be anything that takes 500ms. Have you tried running top while this is going on? You can set it to update quickly so that you can see what's taking up the processor, if anything. In particular, if it's a java thread (process) or Apache process. Are you compiling Apache and connector from source? Have you compiled a new kernel? Have you done all the updates to Mandrake? In particular nptl, gcc, glibc, and kernel. I don't know if many people are using Opteron here. You are picking a pretty new hardware architecture for your first Linux experience. I'm interested to see how many others have experience with this hardware. Oscar On Sun, 23 Nov 2003, Yonatan Goraly wrote: I am in the process of evaluating Linux as a server platform for my application (this is my first Linux experience). The environment is: - Single AMD Opteron 1.8 GHz - Tyan motherboard with 1 GB memory - Mandrake Linux 9.2 AMD64 RC1 - SUN JDK 1.4.2_02 - Tomcat 4.29, without Apache web server The first impression is that the application is extremely slow. I found out that calling getServletConfig().getServletContext().getRequestDispatcher(url).forward(request, response); can take about 500 ms (I put one log command before the call, and the other at the beginning of the forwarded JSP page, so I know that the only call my application does between the log commands is the forward call) Please advise - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Slow on Linux
Howdy, First of all, how fast was the forward call on another platform? OTOH, 500ms for the line of code you gave below is not that atrocious. Both the getRequestDispatcher and forward calls are not lightweight. Yoav Shapira Millennium ChemInformatics -Original Message- From: Yonatan Goraly [mailto:[EMAIL PROTECTED] Sent: Monday, November 24, 2003 2:17 AM To: Tomcat Users List Subject: Slow on Linux I am in the process of evaluating Linux as a server platform for my application (this is my first Linux experience). The environment is: - Single AMD Opteron 1.8 GHz - Tyan motherboard with 1 GB memory - Mandrake Linux 9.2 AMD64 RC1 - SUN JDK 1.4.2_02 - Tomcat 4.29, without Apache web server The first impression is that the application is extremely slow. I found out that calling getServletConfig().getServletContext().getRequestDispatcher(url).forwar d(re quest, response); can take about 500 ms (I put one log command before the call, and the other at the beginning of the forwarded JSP page, so I know that the only call my application does between the log commands is the forward call) Please advise - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Slow on Linux
The same application is deployed on multiple Windows boxes, with excellent performance (unless there is a heavy DB query involved, with a fast network and client machine the response seems to be instant with servers that should be dwarfed by this one). As we start to provide hosted services, the cost of the OS and DB become significant, that is the reason for evaluating Linux. I have selected AMD Opteron since I know that I can fall back to 32 bit OS if the 64 bit is not stable, and that it performs very well in that scenario. I started with Mandrake since it was possible to download ISO images, but I have also ordered an AMD 64 version of SUSE LINUX, since they have better support for that platform. Just to be able to compare, I will install Windows 2000 on the server as well. IMHO, if the performance I see is within the expected range, Windows is a much better OS for that purpose. I have read about performance issues related to Java java using OS threads in Linux, that should be resolved in the 2.6 version of the kernel - might that be related? Red hat have published that they have a solution implemented in their current products, the only problem is that the price is high Shapira, Yoav wrote: Howdy, First of all, how fast was the forward call on another platform? OTOH, 500ms for the line of code you gave below is not that atrocious. Both the getRequestDispatcher and forward calls are not lightweight. Yoav Shapira Millennium ChemInformatics -Original Message- From: Yonatan Goraly [mailto:[EMAIL PROTECTED] Sent: Monday, November 24, 2003 2:17 AM To: Tomcat Users List Subject: Slow on Linux I am in the process of evaluating Linux as a server platform for my application (this is my first Linux experience). The environment is: - Single AMD Opteron 1.8 GHz - Tyan motherboard with 1 GB memory - Mandrake Linux 9.2 AMD64 RC1 - SUN JDK 1.4.2_02 - Tomcat 4.29, without Apache web server The first impression is that the application is extremely slow. I found out that calling getServletConfig().getServletContext().getRequestDispatcher(url).forwar d(re quest, response); can take about 500 ms (I put one log command before the call, and the other at the beginning of the forwarded JSP page, so I know that the only call my application does between the log commands is the forward call) Please advise - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
RE: Slow on Linux
Howdy, I understand and agree with your considerations. The only thing I asked was very simple: how fast does the same call perform on a different platform. Not the overall application, not DB queries, just the exact same line of code (which has four function calls). Yoav Shapira Millennium ChemInformatics -Original Message- From: Yonatan Goraly [mailto:[EMAIL PROTECTED] Sent: Monday, November 24, 2003 2:55 PM To: Tomcat Users List Subject: Re: Slow on Linux The same application is deployed on multiple Windows boxes, with excellent performance (unless there is a heavy DB query involved, with a fast network and client machine the response seems to be instant with servers that should be dwarfed by this one). As we start to provide hosted services, the cost of the OS and DB become significant, that is the reason for evaluating Linux. I have selected AMD Opteron since I know that I can fall back to 32 bit OS if the 64 bit is not stable, and that it performs very well in that scenario. I started with Mandrake since it was possible to download ISO images, but I have also ordered an AMD 64 version of SUSE LINUX, since they have better support for that platform. Just to be able to compare, I will install Windows 2000 on the server as well. IMHO, if the performance I see is within the expected range, Windows is a much better OS for that purpose. I have read about performance issues related to Java java using OS threads in Linux, that should be resolved in the 2.6 version of the kernel - might that be related? Red hat have published that they have a solution implemented in their current products, the only problem is that the price is high Shapira, Yoav wrote: Howdy, First of all, how fast was the forward call on another platform? OTOH, 500ms for the line of code you gave below is not that atrocious. Both the getRequestDispatcher and forward calls are not lightweight. Yoav Shapira Millennium ChemInformatics -Original Message- From: Yonatan Goraly [mailto:[EMAIL PROTECTED] Sent: Monday, November 24, 2003 2:17 AM To: Tomcat Users List Subject: Slow on Linux I am in the process of evaluating Linux as a server platform for my application (this is my first Linux experience). The environment is: - Single AMD Opteron 1.8 GHz - Tyan motherboard with 1 GB memory - Mandrake Linux 9.2 AMD64 RC1 - SUN JDK 1.4.2_02 - Tomcat 4.29, without Apache web server The first impression is that the application is extremely slow. I found out that calling getServletConfig().getServletContext().getRequestDispatcher(url).forw ar d(re quest, response); can take about 500 ms (I put one log command before the call, and the other at the beginning of the forwarded JSP page, so I know that the only call my application does between the log commands is the forward call) Please advise - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: Slow on Linux
The exact execution time of that line of code is not very relevant, since the difference is between an interval I can't notice to an interval I can notice very well - should be at least a factor of x100. I just finished installing RedHat 9 (32 bit), the performance is much better, and the CPU is working much less. I guess it was something related to the Mandrake version I had. It still feels slower than what I am used to on Windows, but I have to make measurements in order to arrive at any conclusions. Shapira, Yoav wrote: Howdy, I understand and agree with your considerations. The only thing I asked was very simple: how fast does the same call perform on a different platform. Not the overall application, not DB queries, just the exact same line of code (which has four function calls). Yoav Shapira Millennium ChemInformatics -Original Message- From: Yonatan Goraly [mailto:[EMAIL PROTECTED] Sent: Monday, November 24, 2003 2:55 PM To: Tomcat Users List Subject: Re: Slow on Linux The same application is deployed on multiple Windows boxes, with excellent performance (unless there is a heavy DB query involved, with a fast network and client machine the response seems to be instant with servers that should be dwarfed by this one). As we start to provide hosted services, the cost of the OS and DB become significant, that is the reason for evaluating Linux. I have selected AMD Opteron since I know that I can fall back to 32 bit OS if the 64 bit is not stable, and that it performs very well in that scenario. I started with Mandrake since it was possible to download ISO images, but I have also ordered an AMD 64 version of SUSE LINUX, since they have better support for that platform. Just to be able to compare, I will install Windows 2000 on the server as well. IMHO, if the performance I see is within the expected range, Windows is a much better OS for that purpose. I have read about performance issues related to Java java using OS threads in Linux, that should be resolved in the 2.6 version of the kernel - might that be related? Red hat have published that they have a solution implemented in their current products, the only problem is that the price is high Shapira, Yoav wrote: Howdy, First of all, how fast was the forward call on another platform? OTOH, 500ms for the line of code you gave below is not that atrocious. Both the getRequestDispatcher and forward calls are not lightweight. Yoav Shapira Millennium ChemInformatics -Original Message- From: Yonatan Goraly [mailto:[EMAIL PROTECTED] Sent: Monday, November 24, 2003 2:17 AM To: Tomcat Users List Subject: Slow on Linux I am in the process of evaluating Linux as a server platform for my application (this is my first Linux experience). The environment is: - Single AMD Opteron 1.8 GHz - Tyan motherboard with 1 GB memory - Mandrake Linux 9.2 AMD64 RC1 - SUN JDK 1.4.2_02 - Tomcat 4.29, without Apache web server The first impression is that the application is extremely slow. I found out that calling getServletConfig().getServletContext().getRequestDispatcher(url).forw ar d(re quest, response); can take about 500 ms (I put one log command before the call, and the other at the beginning of the forwarded JSP page, so I know that the only call my application does between the log commands is the forward call) Please advise - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain information that is confidential, proprietary and/or privileged. This e-mail is intended only for the individual(s) to whom it is addressed, and may not be saved, copied, printed, disclosed or used by anyone else. If you are not the(an) intended recipient, please immediately delete this e-mail from your computer system and notify the sender. Thank you
Re: Slow on Linux
Hi, You could buy an Enterprise edition of a distribution that supports AMD 64-bit. It does not seem to be quite ready in the main distributions. If you aren't willing to compile a new kernel, then I would not recommend going to native 64-bit AMD. Even if you are willing to, you might encounter some problems. And I don't know how much benefit you'd have without compiling any server software you are using. I'm also not sure what performance is like with Sun's or other's JDK. The JDK is probably what I'd be most concerned with performing under AMD64. If it's not good now, it will probably be good soon, since Sun is releasing servers with Opterons. But I don't even see that there is a JDK available for AMD64, so I can't imagine you'll gain anything by all the work being done mostly in Java under 32-bit. See this account: http://www.osnews.com/story.php?news_id=4618 BTW, I'm putting up a new server soon and I will be using dual AthlonMP processors. Oscar On Mon, 24 Nov 2003, Yonatan Goraly wrote: The exact execution time of that line of code is not very relevant, since the difference is between an interval I can't notice to an interval I can notice very well - should be at least a factor of x100. I just finished installing RedHat 9 (32 bit), the performance is much better, and the CPU is working much less. I guess it was something related to the Mandrake version I had. It still feels slower than what I am used to on Windows, but I have to make measurements in order to arrive at any conclusions. Shapira, Yoav wrote: Howdy, I understand and agree with your considerations. The only thing I asked was very simple: how fast does the same call perform on a different platform. Not the overall application, not DB queries, just the exact same line of code (which has four function calls). Yoav Shapira Millennium ChemInformatics -Original Message- From: Yonatan Goraly [mailto:[EMAIL PROTECTED] Sent: Monday, November 24, 2003 2:55 PM To: Tomcat Users List Subject: Re: Slow on Linux The same application is deployed on multiple Windows boxes, with excellent performance (unless there is a heavy DB query involved, with a fast network and client machine the response seems to be instant with servers that should be dwarfed by this one). As we start to provide hosted services, the cost of the OS and DB become significant, that is the reason for evaluating Linux. I have selected AMD Opteron since I know that I can fall back to 32 bit OS if the 64 bit is not stable, and that it performs very well in that scenario. I started with Mandrake since it was possible to download ISO images, but I have also ordered an AMD 64 version of SUSE LINUX, since they have better support for that platform. Just to be able to compare, I will install Windows 2000 on the server as well. IMHO, if the performance I see is within the expected range, Windows is a much better OS for that purpose. I have read about performance issues related to Java java using OS threads in Linux, that should be resolved in the 2.6 version of the kernel - might that be related? Red hat have published that they have a solution implemented in their current products, the only problem is that the price is high Shapira, Yoav wrote: Howdy, First of all, how fast was the forward call on another platform? OTOH, 500ms for the line of code you gave below is not that atrocious. Both the getRequestDispatcher and forward calls are not lightweight. Yoav Shapira Millennium ChemInformatics -Original Message- From: Yonatan Goraly [mailto:[EMAIL PROTECTED] Sent: Monday, November 24, 2003 2:17 AM To: Tomcat Users List Subject: Slow on Linux I am in the process of evaluating Linux as a server platform for my application (this is my first Linux experience). The environment is: - Single AMD Opteron 1.8 GHz - Tyan motherboard with 1 GB memory - Mandrake Linux 9.2 AMD64 RC1 - SUN JDK 1.4.2_02 - Tomcat 4.29, without Apache web server The first impression is that the application is extremely slow. I found out that calling getServletConfig().getServletContext().getRequestDispatcher(url).forw ar d(re quest, response); can take about 500 ms (I put one log command before the call, and the other at the beginning of the forwarded JSP page, so I know that the only call my application does between the log commands is the forward call) Please advise - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] This e-mail, including any attachments, is a confidential business communication, and may contain
Re: Slow on Linux
Yonatan Goraly wrote: The exact execution time of that line of code is not very relevant, since the difference is between an interval I can't notice to an interval I can notice very well - should be at least a factor of x100. I just finished installing RedHat 9 (32 bit), the performance is much better, and the CPU is working much less. I guess it was something related to the Mandrake version I had. It still feels slower than what I am used to on Windows, but I have to make measurements in order to arrive at any conclusions. You're using Opteron - that is 64-bit CPU. Why not compile kernel from the source for your desired platform? Is there a JRE specifically for Opteron? Nix. - To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
