[aarch64-port-dev ] Another Milestone: C2 compiler now runs javac!

[Andrew Dinn]

After a small tweak to the arraycopy fixes Andrew introduced last week I
can now run javac on Hello.java to completion with all methods compiled
by C2!

Attached below my sig are timings for 6 different javac runs (well, 12
-- 2 runs for each case) for the possible combinations of interpreted,
C1 compiled and C2 compiled. They probably don't mean too much until we
adjust the invocation thresholds but it's nice that we are in a position
to do that now :-). The pairs of timings are for the following
configurations:

  running with -Xcomp (always compile methods) combined with either
    exclusively C1
    exclusively C2
    tiered (compile with C1 but recompile hot methods with C2)

  running with --Xmixed (interpret then compile hot methods) with
    exclusively C1
    exclusively C2
    tiered

I have not yet pulled down into my tree Ed's updates to take hotspot up
to b85. So, the push of my fixes will happen once I have assimilated
those changes.

regards,


Andrew Dinn
-----------

[adinn at zenade jdk8-aarch64]$ time
build/linux-aarch64-normal-server-slowdebug/images/j2sdk-image/bin/javac
 -J-server -J-Xcomp Hello.java

real	1m54.973s
user	1m59.059s
sys	0m3.066s
[adinn at zenade jdk8-aarch64]$ time
build/linux-aarch64-normal-server-slowdebug/images/j2sdk-image/bin/javac
 -J-server -J-Xcomp Hello.java

real	1m53.041s
user	1m57.160s
sys	0m3.167s

[adinn at zenade jdk8-aarch64]$ time
build/linux-aarch64-normal-client-slowdebug/images/j2sdk-image/bin/javac
 -J-client -J-Xcomp Hello.java

real	1m39.451s
user	1m41.260s
sys	0m2.440s
[adinn at zenade jdk8-aarch64]$ time
build/linux-aarch64-normal-client-slowdebug/images/j2sdk-image/bin/javac
 -J-client -J-Xcomp Hello.java

real	1m38.437s
user	1m40.204s
sys	0m2.207s

[adinn at zenade jdk8-aarch64]$ time
build/linux-aarch64-normal-server-slowdebug/images/j2sdk-image/bin/javac
 -J-server -J-Xcomp -J-XX:+TieredCompilation Hello.java

real	3m1.810s
user	3m4.430s
sys	0m1.688s
[adinn at zenade jdk8-aarch64]$ time
build/linux-aarch64-normal-server-slowdebug/images/j2sdk-image/bin/javac
 -J-server -J-Xcomp -J-XX:+TieredCompilation Hello.java

real	3m3.156s
user	3m5.551s
sys	0m1.201s

[adinn at zenade jdk8-aarch64]$ time
build/linux-aarch64-normal-server-slowdebug/images/j2sdk-image/bin/javac
 -J-server -J-Xmixed -J-XX:-TieredCompilation Hello.java

real	2m14.487s
user	2m20.234s
sys	0m3.559s
[adinn at zenade jdk8-aarch64]$ time
build/linux-aarch64-normal-server-slowdebug/images/j2sdk-image/bin/javac
 -J-server -J-Xmixed -J-XX:-TieredCompilation Hello.java

real	2m12.304s
user	2m17.191s
sys	0m2.007s

[adinn at zenade jdk8-aarch64]$ time
build/linux-aarch64-normal-client-slowdebug/images/j2sdk-image/bin/javac
 -J-client -J-Xmixed  Hello.java

real	1m0.382s
user	1m6.551s
sys	0m2.317s
[adinn at zenade jdk8-aarch64]$ time
build/linux-aarch64-normal-client-slowdebug/images/j2sdk-image/bin/javac
 -J-client -J-Xmixed  Hello.java

real	1m0.278s
user	1m6.340s
sys	0m2.385s

[adinn at zenade jdk8-aarch64]$ time
build/linux-aarch64-normal-server-slowdebug/images/j2sdk-image/bin/javac
 -J-server -J-Xmixed -J-XX:+TieredCompilation Hello.java

real	1m51.451s
user	2m5.395s
sys	0m2.422s
[adinn at zenade jdk8-aarch64]$ time
build/linux-aarch64-normal-server-slowdebug/images/j2sdk-image/bin/javac
 -J-server -J-Xmixed -J-XX:+TieredCompilation Hello.java

real	1m46.543s
user	2m2.328s
sys	0m2.886s