Re: Tomcat Configuration in Multi Core Systems
Hi, Thanks for your replies. I was sure Server B will never will be able to match Server A even if it had infinite processors in it ( provided everything remains the same). Just wanted to confirm. @David Server B has *116* processors only. Slow because of time taken to handle single request. Regards, Sujeet David Kerber wrote: On 4/23/2011 2:31 PM, Sujeet Singh wrote: Hi, I have two servers which has below configuration, Server A has 32 GB RAM, 4 processors each of 2.8 GHz Server B has 32 GB RAM, 116 processors each of 1.6 GHz. Both servers has tomcat installed having same configuration. Tomcat of server B is at least half as slow as Server A. My question is...just by increasing the worker thread count, the performance of Server B can be increased or we need to do something else also? Tomcat version is 5.5 and Java version is 5. OS used is Solaris 10 SPARC. Thanks Regards, Sujeet First, I assume you mean 16 processors in server B, rather than 116. You need to define slow: time to process a single request, or # of requests it can handle? Server B's clock speed is about half that of A, so I would expect (everything else being equal) that it would run at ~ half the speed of A for a single request. However, given that it has 4x as many processors, it should be able to handle ~ 4x as many simultaneous requests, but each of them will still take about 2x as long as they would on A. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org -- View this message in context: http://old.nabble.com/Tomcat-Configuration-in-Multi-Core-Systems-tp31462700p31464366.html Sent from the Tomcat - User mailing list archive at Nabble.com. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat Configuration in Multi Core Systems
On 4/24/2011 3:07 AM, sujikin wrote: Hi, Thanks for your replies. I was sure Server B will never will be able to match Server A even if it had infinite processors in it ( provided everything remains the same). Just wanted to confirm. @David Server B has *116* processors only. Slow because of time taken to handle single request. 32Gb shared among 116 processors isn't very much RAM for each process (that's why I assumed it was 16, not 116). You'll likely get a performance boost if you can give it more RAM. Regards, Sujeet David Kerber wrote: On 4/23/2011 2:31 PM, Sujeet Singh wrote: Hi, I have two servers which has below configuration, Server A has 32 GB RAM, 4 processors each of 2.8 GHz Server B has 32 GB RAM, 116 processors each of 1.6 GHz. Both servers has tomcat installed having same configuration. Tomcat of server B is at least half as slow as Server A. My question is...just by increasing the worker thread count, the performance of Server B can be increased or we need to do something else also? Tomcat version is 5.5 and Java version is 5. OS used is Solaris 10 SPARC. Thanks Regards, Sujeet First, I assume you mean 16 processors in server B, rather than 116. You need to define slow: time to process a single request, or # of requests it can handle? Server B's clock speed is about half that of A, so I would expect (everything else being equal) that it would run at ~ half the speed of A for a single request. However, given that it has 4x as many processors, it should be able to handle ~ 4x as many simultaneous requests, but each of them will still take about 2x as long as they would on A. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat Configuration in Multi Core Systems
That statement is only correct if memory footprint is an issue, or if each thread allocates a lot of dynamic memory that isn't shared by other threads. If there isn't much memory required, or if most of the data stored in memory is heavily shared, adding more memory will not increase performance. Each processor has it's own on-die memory caches, which affect performance more than the amount of RAM all together (especially with good memory locality design). If all threads are trying to access an object that resides in the memory local to processor 1, adding more memory won't change the fact that access to this object from other processors will require non-local memory access through CPU boundaries. Regards, Justin Randall Sent from my BlackBerry device -Original Message- From: David Kerber dcker...@verizon.net Date: Sun, 24 Apr 2011 08:54:35 To: Tomcat Users Listusers@tomcat.apache.org Reply-To: Tomcat Users List users@tomcat.apache.org Subject: Re: Tomcat Configuration in Multi Core Systems On 4/24/2011 3:07 AM, sujikin wrote: Hi, Thanks for your replies. I was sure Server B will never will be able to match Server A even if it had infinite processors in it ( provided everything remains the same). Just wanted to confirm. @David Server B has *116* processors only. Slow because of time taken to handle single request. 32Gb shared among 116 processors isn't very much RAM for each process (that's why I assumed it was 16, not 116). You'll likely get a performance boost if you can give it more RAM. Regards, Sujeet David Kerber wrote: On 4/23/2011 2:31 PM, Sujeet Singh wrote: Hi, I have two servers which has below configuration, Server A has 32 GB RAM, 4 processors each of 2.8 GHz Server B has 32 GB RAM, 116 processors each of 1.6 GHz. Both servers has tomcat installed having same configuration. Tomcat of server B is at least half as slow as Server A. My question is...just by increasing the worker thread count, the performance of Server B can be increased or we need to do something else also? Tomcat version is 5.5 and Java version is 5. OS used is Solaris 10 SPARC. Thanks Regards, Sujeet First, I assume you mean 16 processors in server B, rather than 116. You need to define slow: time to process a single request, or # of requests it can handle? Server B's clock speed is about half that of A, so I would expect (everything else being equal) that it would run at ~ half the speed of A for a single request. However, given that it has 4x as many processors, it should be able to handle ~ 4x as many simultaneous requests, but each of them will still take about 2x as long as they would on A. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Tomcat Configuration in Multi Core Systems
Hi, I have two servers which has below configuration, Server A has 32 GB RAM, 4 processors each of 2.8 GHz Server B has 32 GB RAM, 116 processors each of 1.6 GHz. Both servers has tomcat installed having same configuration. Tomcat of server B is at least half as slow as Server A. My question is...just by increasing the worker thread count, the performance of Server B can be increased or we need to do something else also? Tomcat version is 5.5 and Java version is 5. OS used is Solaris 10 SPARC. Thanks Regards, Sujeet
Re: Tomcat Configuration in Multi Core Systems
On 4/23/2011 2:31 PM, Sujeet Singh wrote: Hi, I have two servers which has below configuration, Server A has 32 GB RAM, 4 processors each of 2.8 GHz Server B has 32 GB RAM, 116 processors each of 1.6 GHz. Both servers has tomcat installed having same configuration. Tomcat of server B is at least half as slow as Server A. My question is...just by increasing the worker thread count, the performance of Server B can be increased or we need to do something else also? Tomcat version is 5.5 and Java version is 5. OS used is Solaris 10 SPARC. Thanks Regards, Sujeet First, I assume you mean 16 processors in server B, rather than 116. You need to define slow: time to process a single request, or # of requests it can handle? Server B's clock speed is about half that of A, so I would expect (everything else being equal) that it would run at ~ half the speed of A for a single request. However, given that it has 4x as many processors, it should be able to handle ~ 4x as many simultaneous requests, but each of them will still take about 2x as long as they would on A. - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat Configuration in Multi Core Systems
Hi Sujeet, In any application, speed is primarily determined by serial portions of code execution. Speed isn't something that is increased by adding more threads, however throughput can usually be increased which has the illusion of increasing speed for a given workload. That said, you should examine the serial parts of your application code and try to leverage additional parallelism (i.e. If you have multiple tasks within a single request to complete which aren't heavily dependent on each other). This can help reduce the time it takes for a given request to complete. If each request is handled only by a single thread then it should be expected that a CPU with 1/2 the speed performs 1/2 as fast. Regards, Justin Randall --Original Message-- From: Sujeet Singh To: users@tomcat.apache.org ReplyTo: Tomcat Users List Subject: Tomcat Configuration in Multi Core Systems Sent: Apr 23, 2011 14:31 Hi, I have two servers which has below configuration, Server A has 32 GB RAM, 4 processors each of 2.8 GHz Server B has 32 GB RAM, 116 processors each of 1.6 GHz. Both servers has tomcat installed having same configuration. Tomcat of server B is at least half as slow as Server A. My question is...just by increasing the worker thread count, the performance of Server B can be increased or we need to do something else also? Tomcat version is 5.5 and Java version is 5. OS used is Solaris 10 SPARC. Thanks Regards, Sujeet Sent from my BlackBerry device
