- From: Yves Lafon <ylafon@w3.org>
- Date: Thu, 16 Jan 2003 11:30:27 +0100 (MET)
- To: Frank Kurzawa <frank@kurzawa.com>
- cc: Roger Marquis <marquis@roble.com>, www-jigsaw@w3.org
On Wed, 15 Jan 2003, Frank Kurzawa wrote: > > > I believe in Linux, each THREAD gets a separate Process ID, even though > it is not actually a separate process. So if, for instance, you do a ps > command in Linux, you will see a separate listing for each thread. OTOH, > in Solaris, where each thread DOES NOT get a separate Process ID, a ps > command will only show a single entry. That's right, in Linux, each thread is a separate process, and there is no notion of a global process for those threads. This leads to an interesting problem: If you want to use the native code to change the UID/GID or chroot the server, (ie: to start the server as root to bind port 80 and change its uid/gid to nobody for obvious reasons), on linux it will happen... on one thread instead of all threads of the global process. It seems that the recent development in the 2.5 kernel series and the new libthreads developped are fixing this (to say the least) shortcoming. Also to clarify the process issue on linux, most of the memory used by those process are shared amongst them, so the results of ps are not as alarming as it may sound. > At 6:22 PM -0800 1/15/03, Roger Marquis wrote: > >Has anyone noticed that jigsaw.sh starts a large number of java > >processes under Linux (RH 7.3, x86)? I'm seeing 80+ java processes like > >this one: > > > > ... > > root 7547 0.0 8.2 244268 15816 ? S Jan14 0:00 java > > org.w3c.jigsaw.Main -root /usr/local/jigsaw/Jigsaw/ > > ... > > > >whereas under Solaris (SPARC 5.8) there's just a single process: > > > > root 19372 14.6 1.34930418104 pts/7 S 18:17:10 0:03 java > > org.w3c.jigsaw.Main -root /usr/local/jigsaw_2.2.2/Jigsaw Note that "top" will give you the the number of threads used on solaris (the THR entry) -- Yves Lafon - W3C "Baroula que barouleras, au tiéu toujou t'entourneras."
Received on Thursday, 16 January 2003 05:30:34 UTC