shipilev

5 ms·

1.
by shipilev 7y ago
The post misleads readers into thinking that JVM runs the GC before exit. It does not. When I was writing the Epsilon JEP, I meant that it might be futile to have a hundreds-of-ms-long GC cycle, when the program exits very soon anyway, and
2.
by shipilev 7y ago
Oracle is in a separate category , no question there. It was my mistake to mention other vendors in the thread that is about AdoptOpenJDK. I just wanted to show where the AdoptOpenJDK sits in the larger OpenJDK ecosystem: they are importan
3.
by shipilev 7y ago
Granted, Oracle does contribute lots of code. As the result, lots of Oracle-created code gets backported too. That said, I see people backport a lot of code/tests that they wrote themselves, and/or with the help of non-Oracle cont
4.
by shipilev 7y ago
There are many OpenJDK(-based) distributions out there, mostly built from the OpenJDK {8, 11} Update Releases sources. AdoptOpenJDK provides one of those distributions. Most of the actual backport work is done by the OpenJDK participants, n
5.
by shipilev 7y ago
Red Hat also provides binaries built from the unmodified OpenJDK source here: https://adoptopenjdk.net/upstream.html -- which could be downloaded without developer account.
6.
by shipilev 7y ago
In tracing collectors, marking (and generally walking the heap in possibly random order) would take a significant amount of time. After marking is done, you may decide to move only a few objects, so the overhead of the copying itself is not
7.
by shipilev 7y ago
I agree with you and present even a stronger statement: talking about GC pauses without measuring the actual end-to-end latencies may give the false impression! The overall throughput might look good, but threads might experience bad local
8.
by shipilev 7y ago
> throttling pauses are not counted as GC pauses Yes. All GCs I know employ the negative feedback loops between allocators and GCs. Stop-the-world GCs are on the far side of that spectrum: there, allocation failure induces "throttli
9.
by shipilev 7y ago
The pause time behavior depends a lot on what is going on in application itself. Shenandoah wiki has a section on that: https://wiki.openjdk.java.net/display/shenandoah/Main#Main-G... . It also depends on the hardw
10.
by shipilev 11y ago
Author's note: Interesting to see this resurfacing after a year. JMH had improved significantly since then, including the release of 1.0.