tomcat-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "George Sexton" <geor...@mhsoftware.com>
Subject RE: /dev/urandom usage
Date Sat, 15 Aug 2009 02:40:21 GMT
> -----Original Message-----
> From: Mark Thomas [mailto:markt@apache.org]
> Sent: Friday, August 14, 2009 5:57 PM
> To: Tomcat Developers List
> Subject: Re: /dev/urandom usage
> 
> George Sexton wrote:
> > I've got a question and it's kind of deep developer question.
> >
> > I was poking around today looking at my tomcat instance running under
> Linux.
> >
> > I was looking in the /proc/<pid>/fd directory, which is the list of
> file
> > descriptors open by my servlet application.
> >
> > There are around 1400 open file descriptors. What I don't understand
> is why
> > there are some 800+ file descriptors that are open to /dev/urandom.
> On this
> > particular host there are some 400 configured hosts/contexts.
> >
> > On another server, there are 1100 file descriptors open to
> /dev/urandom. For
> > this server, there are around 200 configured hosts/contexts.
> >
> > I'm using Sun JDK 1.6.0_14 on OpenSUSE 11.1. One machine is amd64
> > architecture, while the other is i386.
> >
> > Does anyone have any idea what could be causing this? It seems kind
> of
> > strange to have 800-1200 file descriptors open to one pseudo file.
> 
> Take a look at ManagerBase.getRandom(). The probably explains the
> majority of it.
> 
> Mark

Hmmmm. You'll have to execuse me if this is a dumb question, but does that
mean that each session is creating its own instance of
java.security.SecureRandom, and each instance of java.security.SecureRandom
is opening /dev/urandom?



George Sexton
MH Software, Inc.
http://www.mhsoftware.com/
Voice: 303 438 9585


---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@tomcat.apache.org
For additional commands, e-mail: dev-help@tomcat.apache.org


Mime
View raw message