This issues has now been fixed in the svn. On Wed, Mar 6, 2013 at 2:34 PM, Louie, Joshua D <[email protected]> wrote: > Hi, > > We have a case where using boost asio is causing us a huge > performance penalty. I pulled the client/server example code from the boost > website (modified to pass more data) and found that when I wrapped the > server using DMTCP, I saw at least a 100x slowdown. No matter what the > timeout given by the original call to epoll_wait, we always call > _real_epoll_wait with 1000. > > > > I think the code should maybe do something like this: > > 1) If timeout >= 1000, use it in sets of 1000 > > 2) If timeout < 1000 && timeout >= 0, use the given timeout > > 3) If timeout < 0, then … > > a. Use a low number like 5 or 10, but this might result in excessive > calls to _real_epoll_wait > > b. Use an incrementing counter for timeout which caps out at 100 > > > > In my case, both a and b worked out well for me bringing performance back to > pretty much normal (aka without dmtcp). Of course, real implementation of it > is up to however you see it done best. I saw this problem on 1.2.6 and on > the trunk as of several months ago. I saw the latest trunk is significantly > reorganized, but I’ve not tried it with the latest trunk (though the code in > eventwrappers.cpp is still the same). > > > > Joshua Louie > > > ------------------------------------------------------------------------------ > Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester > Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the > endpoint security space. For insight on selecting the right partner to > tackle endpoint security challenges, access the full report. > http://p.sf.net/sfu/symantec-dev2dev > _______________________________________________ > Dmtcp-forum mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/dmtcp-forum >
------------------------------------------------------------------------------ Symantec Endpoint Protection 12 positioned as A LEADER in The Forrester Wave(TM): Endpoint Security, Q1 2013 and "remains a good choice" in the endpoint security space. For insight on selecting the right partner to tackle endpoint security challenges, access the full report. http://p.sf.net/sfu/symantec-dev2dev _______________________________________________ Dmtcp-forum mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/dmtcp-forum
