> This PR improves the startup time for libgraal by speeding up how
> `VM.savedProps` is copied into libgraal. This data structure is now
> serialized to a native buffer directly from C++ and the native buffer is then
> directly decoded by libgraal.
>
> ## Times
>
> The basic benchmarking below shows that this change brings the time for a nop
> Java app with eager libgraal initialization (2) down to almost the same time
> as lazy libgraal initialization (1). The latter typically means no libgraal
> initialization happens as a top tier JIT compilation is never scheduled in
> such a short running app.
>
>
> public class Nop {
> public static void main(String[] args) {}
> }
>
>
> (1) Baseline (no options):
>
>> for i in (seq 10); java Nop; end
> 0.05 real 0.04 user 0.01 sys
> 0.04 real 0.03 user 0.01 sys
> 0.04 real 0.03 user 0.01 sys
> 0.04 real 0.03 user 0.01 sys
> 0.03 real 0.03 user 0.00 sys
> 0.04 real 0.03 user 0.01 sys
> 0.04 real 0.03 user 0.00 sys
> 0.03 real 0.03 user 0.00 sys
> 0.04 real 0.03 user 0.01 sys
> 0.03 real 0.03 user 0.00 sys
>
>
> (2) Eagerly initialize libgraal (with PR):
>
>> for i in (seq 10); /usr/bin/time java -XX:+EagerJVMCI Nop; end
> 0.06 real 0.04 user 0.01 sys
> 0.05 real 0.03 user 0.01 sys
> 0.05 real 0.03 user 0.01 sys
> 0.05 real 0.03 user 0.01 sys
> 0.05 real 0.03 user 0.01 sys
> 0.05 real 0.03 user 0.01 sys
> 0.05 real 0.03 user 0.01 sys
> 0.05 real 0.03 user 0.01 sys
> 0.05 real 0.03 user 0.01 sys
> 0.05 real 0.03 user 0.01 sys
>
>
> (3) Eagerly initialize libgraal (without PR):
>
>> for i in (seq 10); /usr/bin/time java -XX:+EagerJVMCI Nop; end
> 0.11 real 0.08 user 0.02 sys
> 0.08 real 0.06 user 0.01 sys
> 0.08 real 0.07 user 0.01 sys
> 0.10 real 0.07 user 0.01 sys
> 0.08 real 0.06 user 0.01 sys
> 0.10 real 0.07 user 0.01 sys
> 0.08 real 0.07 user 0.01 sys
> 0.08 real 0.07 user 0.01 sys
> 0.08 real 0.06 user 0.01 sys
> 0.08 real ...
Doug Simon has updated the pull request with a new target base due to a merge
or a rebase. The incremental webrev excludes the unrelated changes brought in
by the merge/rebase. The pull request contains one additional commit since the
last revision:
copy system properties into libgraal more efficiently
-------------
Changes:
- all: https://git.openjdk.org/jdk/pull/14291/files
- new: https://git.openjdk.org/jdk/pull/14291/files/c3c04749..7a82c24e
Webrevs:
- full: https://webrevs.openjdk.org/?repo=jdk&pr=14291&range=02
- incr: https://webrevs.openjdk.org/?repo=jdk&pr=14291&range=01-02
Stats: 26320 lines in 384 files changed: 24869 ins; 633 del; 818 mod
Patch: https://git.openjdk.org/jdk/pull/14291.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/14291/head:pull/14291
PR: https://git.openjdk.org/jdk/pull/14291
