Re: [PATCH] Save space/time: completedHosts "lifetimes"

[Brandon Enright <bmenrigh () ucsd edu>]

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On Mon, 29 Sep 2008 13:25:46 -0600
David Fifield <david () bamsoftware com> wrote:

> On Mon, Sep 29, 2008 at 02:13:42PM -0500, Kris Katterjohn wrote:
> > > Fyodor, I remember you mentioned UDP scans with a big host group
> > > size taking gigs of RAM. I debugged for a while looking for a
> > > memory leak but didn't find anything. Maybe the ever-growing
> > > completedHosts list was the culprit?
> >
> > What sized host groups were these?
>
> It was with host groups of 2048 and -p1-65535.
>
> David Fifield

I've experienced this memory consumption problem first-hand.  I'm not
sure it is a leak because is doesn't appear to grow unbounded across
hostgroups.  I ended up using a hostgroup of about 256 which had the
bad habit of coming very close to running my box (8 GB of ram) out of
memory.

A few months ago I spent a few hours testing at it seemed that
increasing the hostgroup linearly translated to a non-linear increase
in memory consumption. I was planning on writing a script to drive Nmap
with ever-increasing hostgroup sizes and record the max/min/average
memory usage for each.

Unfortunately day-to-day operations around here have kept me busy
enough that I've put aside most of my non-critical projects.  I'm
happy to use my limited time to help you test/debug.  If you give me a
script or some commands I'll run them on one of our scanning boxes.

Brandon

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