-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 John,
On 5/18/2009 4:17 PM, johnrock wrote: > Based on budget, the affordable options I have to choose from appear to be: > 1 single core @3Ghz > or > 1 dual core @~2.1Ghz > or > 1 Quad core @~2.1Ghz What are the types of cores? Are any of them hyperthreaded? Some of the older Intel cores (like the P4) run at a high clock speed but aren't as good as the newer, lower-speed cores. My Core2 Duo @ 2.1GHz beats the crap out of my old P4 3.0GHz HT chip (same number of logical cores, older one has higher clock speed rating). > My question is: Which processor configuration do you think would benefit > tomcat more? Given the limited/basic options I have,would tomcat benefit > more from 2 or more cores or is speed more important? Without going into too much detail (and risking flames!): - - More logical cores are better than less - - More physical cores are better than less (and better than more logical cores like hyperthreaded) - - More physical CPUs aren't as good as multi-core chips with the same total number of cores (single chip sync'ing with itself is faster than reaching across the mobo to another chip to do the same thing) Java web applications are, by definition, multi-threaded. The more logical processing units you have, the faster your webapp will run, since each core can only do one thing at a time! In my experience, bus speed, memory speed, memory size, and disk speed are the biggest differentiating factors for servers. Let's face it: your web application is spending more time allocating, de-allocating, and copying memory around than it is performing numerical computations. Most of the time, your CPU is waiting on data to travel from one place to another, not the other way around. I would focus on factors other than the CPU, honestly. - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkoRx80ACgkQ9CaO5/Lv0PDIlACfUfuDHHH+tfR+Otv9hLMjIPc+ YGEAoIDZx8VX6lDp9PY5u3x1sE+cM5Ij =feDA -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
