[Mono-dev] GC startup time on windows (in DllMain)

[Aras Pranckevicius]

Hi,

When profiling our startup times on Windows, I noticed that GC_init
takes quite long (~1.5 seconds on P4 3GHz), called from DllMain.

The call graph goes roughly like this: DllMain -> GC_init ->
GC_init_inner -> GC_gcollect_inner (GC_try_to_collect_inner) ->
GC_stopped_mark -> GC_mark_some_inner -> GC_mark_from. In
GC_mark_from, still 1.5 seconds spent.

After that it's strange - VTune just does not say anything - 1.5
seconds spent in there, nothing spent in functions called from it.

We do not have this issue on Macs, where loading mono bundle takes
almost no time. When I tested our windows version under VMWare, the
startup time was also fast for some reason.

Is the startup time supposed to be this long, or am I just having some issue?


Aras Pranckevicius
otee.dk