[Mono-bugs] [Bug 565637] Memory allocation very slow

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Wed Dec 23 08:27:14 EST 2009



Mark Probst <mprobst at novell.com> changed:

           What    |Removed                     |Added
                 CC|                            |mprobst at novell.com

--- Comment #5 from Mark Probst <mprobst at novell.com> 2009-12-23 13:27:08 UTC ---
SGen on trunk runs this simple test

public class main {
    public static int Main () {
    int i;
    for (i = 0; i < 50000000; ++i) {
        object [] arr = new object [32];
    return 0;

in 9 seconds, vs 73 seconds with Boehm.  Note, however, that the speedup is to
a big part due not to better allocation speed, but to the fact that a copying
garbage collector deals with ephemeral garbage much better.  Running both with
--stats we get for SGen:

Minor GC collections:   14171
Major GC collections:   567
Minor GC time in msecs: 893.863000
Major GC time in msecs: 1064.391000

and for Boehm:

Major GC collections:   159746
Major GC time in msecs: 48177.850000

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