On 3/26/17 8:43 PM, Claes Redestad wrote:
+1, at least to make it an optional setting.
Making it heavily multi-threaded by default may be a pessimization when
we're doing full image builds, cf. how many of the java tools in the
build is using serial GC and fewer compiler threads to play nice under
heavy parallelism.
Have you done any assessment on whether this has any effect on static
footprint and performance on the resulting images?
I haven't done any formal measurements. Anecdotally when I ran a class
loading benchmark it shows no noticeable difference in performance. I
didn't measure the size of the libjvm.so
Thanks
- Ioi
/Claes
On 2017-03-26 12:30, Ioi Lam wrote:
I just tried adding -fuse-ld=gold to the g++ linker flags, and my
libjvm.so link time shrinks from 18 seconds to 6 seconds. And that's
with single threaded linking. If I add "-Wl,--threads
-Wl,--thread-count,8" it becomes 4 seconds. It doesn't seem to scale
after 8 threads.
Any plans for adding official (perhaps optional) support for gold in the
JDK build system?
Thanks
- Ioi
