Changing from using a std::vector<int> with a single space allocation (not push_back) to a int[] improved the speed but not scalability... Now that you've fixed the measurement problem, give it a try with other containers, and doing other operations. You will find some combination that demonstrates that this does not always scale like you expect. -----Original Message----- From: boost-bounces@lists.boost.org [mailto:boost-bounces@lists.boost.org] On Behalf Of James Sutherland Sent: Wednesday, May 14, 2008 5:23 PM To: boost@lists.boost.org Subject: Re: [boost] very poor thread performance
The result has been noticed before. In fact I wrote about it in several posts on c.l.c++.m, and in N2486 in the first few pages it uses this effect to illustrate a point about allocators. Nevertheless, the result is still surprising!! What is worse is that different compilers and libraries will give you way different results for this test, so it is not just a function of Intel. ( I have not tried to reproduce the results on anything but intel).
Changing from using a std::vector<int> with a single space allocation (not push_back) to a int[] improved the speed but not scalability... James _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost Visit our website at http://www.ubs.com This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. E-mails are not encrypted and cannot be guaranteed to be secure or error-free as information could be intercepted, corrupted, lost, destroyed, arrive late or incomplete, or contain viruses. The sender therefore does not accept liability for any errors or omissions in the contents of this message which arise as a result of e-mail transmission. If verification is required please request a hard-copy version. This message is provided for informational purposes and should not be construed as a solicitation or offer to buy or sell any securities or related financial instruments.