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Re: non existent script called with --script=all
From: Michael Pattrick <mpattrick () rhinovirus org>
Date: Tue, 28 Apr 2009 01:42:27 -0400

Here is the same benchmark on windows.

No test files.

Starting Nmap 4.85BETA8 ( http://nmap.org ) at 2009-04-28 01:33
Eastern Daylight Time
NSE: Updating rule database.
NSE script database updated successfully.
Nmap done: 0 IP addresses (0 hosts up) scanned in 2.47 seconds

Version Number:   Windows NT 6.0 (Build 6001)
Exit Time:        1:33 am, Tuesday, April 28 2009
Elapsed Time:     0:00:02.593
Process Time:     0:00:01.513
System Calls:     105812
Context Switches: 12577
Page Faults:      63258
Bytes Read:       3354781
Bytes Written:    1064296
Bytes Other:      50148

1000 test files.

Starting Nmap 4.85BETA8 ( http://nmap.org ) at 2009-04-28 01:33
Eastern Daylight Time
NSE: Updating rule database.
NSE script database updated successfully.
Nmap done: 0 IP addresses (0 hosts up) scanned in 2.45 seconds

Version Number:   Windows NT 6.0 (Build 6001)
Exit Time:        1:33 am, Tuesday, April 28 2009
Elapsed Time:     0:00:02.694
Process Time:     0:00:02.277
System Calls:     123477
Context Switches: 14396
Page Faults:      64709
Bytes Read:       35427634
Bytes Written:    1127376
Bytes Other:      292258

5000 test files.

Starting Nmap 4.85BETA8 ( http://nmap.org ) at 2009-04-28 01:35
Eastern Daylight Time
NSE: Updating rule database.
NSE script database updated successfully.
Nmap done: 0 IP addresses (0 hosts up) scanned in 8.73 seconds

Version Number:   Windows NT 6.0 (Build 6001)
Exit Time:        1:35 am, Tuesday, April 28 2009
Elapsed Time:     0:00:10.109
Process Time:     0:00:08.252
System Calls:     299197
Context Switches: 52985
Page Faults:      56014
Bytes Read:       137127367
Bytes Written:    10547361
Bytes Other:      1307085

10000 test files.

Starting Nmap 4.85BETA8 ( http://nmap.org ) at 2009-04-28 01:37
Eastern Daylight Time
NSE: Updating rule database.
NSE script database updated successfully.
Nmap done: 0 IP addresses (0 hosts up) scanned in 22.53 seconds

Version Number:   Windows NT 6.0 (Build 6001)
Exit Time:        1:37 am, Tuesday, April 28 2009
Elapsed Time:     0:00:22.604
Process Time:     0:00:21.356
System Calls:     717512
Context Switches: 113312
Page Faults:      99350
Bytes Read:       170074212
Bytes Written:    13444769
Bytes Other:      4707488



On Tue, Apr 28, 2009 at 12:20 AM, David Fifield <david () bamsoftware com> wrote:
On Mon, Apr 27, 2009 at 06:45:34PM -0700, Fyodor wrote:
On Mon, Apr 27, 2009 at 05:18:02PM -0500, Kris Katterjohn wrote:

When I suggested this very same idea over a year ago (when it was shot down by
you and Brandon), you said that Diman had already tested with many scripts:

http://seclists.org/nmap-dev/2008/q1/0514.html

(and http://seclists.org/nmap-dev/2008/q1/0513.html is Brandon's detailed reply)

Hi Kris.  Nice to hear from you!  I suppose that if we end up removing
script.db after all, you can give us a big "I told you so" :).

Diman did do some testing with 10,000+ scripts (well, basically copies
of the same simple script), but that was years ago.  NSE has changed
dramatically since then, so I'd like to see newer benchmarks with
large numbers of scripts before I'd feel comfortable removing
script.db.  We can't really decide whether the logistical hassle is
worth the performance gain until we actually have measurements of the
(presumed) performance gain.  But if the cost of generating the
information at runtime with 1,000+ scripts is immaterial, I'd favor
removing script.db.  We could always revive the system if we ever
exceed that number of scripts and need it again.

When Patrick was preparing to merge the Lua implementation of NSE, he
ran a bunch of benchmarks, including one of --script-updatedb. Here are
his times for generating a script database with 1,000 no-op scripts:

real    0m0.166s
user    0m0.094s
sys     0m0.030s

And I guess I have a slower computer because I got

real    0m0.641s
user    0m0.516s
sys     0m0.096s

I attached the script he used to generate the scripts if someone else
wants to reproduce the results. We should compare the times with the
time taken to parse, say, nmap-os-db to get some perspective.

David Fifield


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