Date: Thu, 23 May 2002 16:14:08 -0700 From: Bill Huey <billh@gnuppy.monkey.org> To: Ari Suutari <ari.suutari@syncrontech.com> Cc: Tim E Schafer <tim_schafer@agship.com>, Java FreeBSD <freebsd-java@FreeBSD.ORG>, freebsd-emulation@FreeBSD.ORG Subject: Re: All Linux JDK with Hotspot or JIT unstable on FreeBSD Message-ID: <20020523231408.GA2662@gnuppy.monkey.org> In-Reply-To: <200205231024.23276.ari.suutari@syncrontech.com> References: <042e01c201ea$492bd6a0$441814ac@newtim> <200205231024.23276.ari.suutari@syncrontech.com>
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On Thu, May 23, 2002 at 10:24:23AM +0300, Ari Suutari wrote: > It is known that linux jdks with hotspot are not stable on > FreeBSD linux emulation. Must be something hard to fix, > since it has been like this for quite a long time. > (maybe this has something to do with signal handling > differences between linux and freebsd ?) It's almost certain the case. Linux's clone() uses SIGCHLD to notify thread termination and other crazy non-Posix things in their threading system. They can't implement the full specificiation without some kind of kernel based signal sharing and other things. The HotSpot code supporting this stuff is all over the place both inside and outside of their threading implementation. > Yes. Maybe someone on freebsd-emulation mailing > list could help. Before this gets fixed, one must be mad > to run a production server using linux-jdk + hotspot + freebsd. > Current solutions are (to my understanding) to either > use native jdk 1.3 (which has no hotspot - yet - so performance > is not so great) or install linux to your server and use linux-jdk > (which works ok but you can kiss goodbye for freebsd :-() > > Ari S. The FreeBSD port of HotSpot over here is half running. I'm having problems with the ABI layer that mediates/marshalls native calls from the HotSpot system to the raw JVM. It uses the JVM for first class type support facilities. Threads spawn and block correctly, the HotSpot interpreter subsystem initializes correctly, classes initialize correctly, but it's having problems doing some kind of JVM_ArrayCopy(), which implies some kind of stack corruption problem. It's encouraging, yet disappointing since I'm just this random *guy* that's just getting into what is probably the most advanced compiler of its kind on that planet that's written in high complicated C++ program/class structure. It's basically a SMPng-ed GCC in C++. http://www.cs.ucsb.edu/labs/oocsb/self/ The Self runtime is what HotSpot is originally based upon and does insanely complicate dynamic type analysis, adaptive inlining and other things that pretty much represents what the state-of-the-art is for this kind of system. bill To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-java" in the body of the message
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