Am 23.11.2018 um 14:36 schrieb Simon Kissel: > Hi Adriaan, > >> I find the phrase. "FPC's terrible multi-threading performance" >> unjust. > > Well, see the complete thread to better understand what this > is about, and what progress is being made. So far a 20% > improvement has been made, which kinda is like a proof that > there was something to improve ;) > >> When I do multi-threading >> with FPC, I get a near N speed improvement (on i386 and x86_64) where N is >> the number of cores, >> including hyper-threaded cores .... > > This isn't about FPC's code not scaling with N cores, it does. > It is about it being slow as soon as threads are used *at all*, > due to TLS stuff and exception handling. It's slow in a linear > fashion, so to say... >
Actually, most of the improvements so far are no related to threading. In particular r40339 helped a lot, it was a bug fix: the compiler assumed that a certain sub expression was written while it not was and this prevented CSE. _______________________________________________ fpc-devel maillist - fpc-devel@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-devel
