On Mon, Apr 28, 2014 at 06:12:18PM +0200, Tomas Hajny wrote: > On Mon, April 28, 2014 17:56, Mattias Gaertner wrote: > > On Mon, 28 Apr 2014 17:20:17 +0200 > > Petr Kristan <petr.kris...@epos.cz> wrote: > > > >> Hi > >> > >> I have some application with huge usage ReAllocMem and I found the big > >> performance difference if application is compiled with -gv option (cca > >> 20x faster) then without -gv option. > > > > -gv generates code for valgrind. > > It should be slower with -gv. > > > >> I suspect fpc heap manager. Is possible to tune fpc heap manager? > >> Is some difference in heap manager if application is comiled with -gv or > >> without -gv option? > > Use of valgrind requires/triggers use of cmem. Depending on the particular > use case (and potentially also the target platform), cmem may indeed be > faster. Platform is x86_64 Linux.
> Others would be better positioned for more detailed comparison among > various heap managers with regard to speed in different use cases, overall > memory requirements achieved by reuse of previously allocated memory, etc. Reuse of previously allocated memory - it really can be my problem. Here is about 200x call ReAllocMem increasing buffer from 4kB to 80MB. It looks like as buffer is increasing ReAllocMem is slowing. But I must verify this feeling. Petr -- Petr Kristan . EPOS PRO s.r.o., Smilova 333, 530 02 Pardubice tel: +420 461101401 Czech Republic (Eastern Europe) fax: +420 461101481 _______________________________________________ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel
