Dear Demetres,

sounds a bit drastic!
The second point alone would certainly suffice, because then no forking is done.

What kind of hardware is that?
I would expect that on a contemporary workstation you have 8GB of RAM or more; 
that would allow for 8 or more processes.
Do you have a swapfile? If not, create one.

Please check out 
https://strucbio.biologie.uni-konstanz.de/xdswiki/index.php/Performance

Best wishes,
Kay


On Tue, 29 Nov 2022 09:34:49 +0200, Demetres D. Leonidas 
<ddleoni...@bio.uth.gr> wrote:

>Dear Kay,
>
>after some digging and help from Max Nanao we found that the problem  
>was the memory.  It was fulling rapidly. The workaround was to:
>
>1. unzip the cbf files prior to processing
>
>2. use maximum number of jobs 1
>
>3. use number of processors 4
>
>4. run xds_par
>
>Many thanks for all your help
>
>Demetres
>
>On 11/29/2022 9:03 AM, Kay Diederichs wrote:
>> Dear Demetres,
>>
>> I agree with what James says: this is the operating system trying to to 
>> prevent, in an over-zealous way, the
>> forking of too many or too big (in terms of memory) processes.
>> In other words, XDS hasn't changed, but the operating system changed - it 
>> applies different limits to its processes.
>> Your friendly system administrator should try to find out exactly which 
>> limit(s) changed, and reset the value(s).
>> Perhaps a hint is in the Release Notes of Ubuntu 22.04 ?
>>
>> Pls report here when you've found it - currently you are the only one 
>> reporting it.
>>
>> Best wishes,
>> Kay
>>
>>
>> On Mon, 28 Nov 2022 12:06:43 -0800, James Holton <jmhol...@lbl.gov> wrote:
>>
>>> Sounds like your kernel might think "forkxds" is creating a "fork
>>> bomb".  Too many sub-processes firing off in too short a time triggers
>>> this.  On one of my systems, I fixed it by editing
>>> /etc/security/limits.d/20-nproc.conf so that users are allowed ~10x more
>>> pids than normal.  This tends to prevent these mysterious "Killed" errors.
>>>
>>> HTH?
>>>
>>> -James Holton
>>> MAD Scientist
>>>
>>>
>>> On 11/28/2022 7:44 AM, Demetres D. Leonidas wrote:
>>>> Dear all,
>>>>
>>>> I do not know if this is the right list and I would like to apologize
>>>> if it is not.
>>>>
>>>> We have repeatedly experienced xds crashes in machines running ubuntu
>>>> 22.04.1 with the following message repeated several times at the
>>>> INTEGRATE step
>>>>
>>>> /usr/local/bin/forkxds: line 60:  3427 Done echo "$itask"
>>>>
>>>>        3428 Killed                  | $amain
>>>>
>>>> We are trying to process data from P13 at EMBL-Hamburg.
>>>>
>>>> We are running XDS version Jan 10, 2022 BUILT=20220820
>>>>
>>>> Any ideas ?
>>>>
>>>> Demetres
>>>>
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>-- 
>-----------------------------------------------
>Dr. Demetres D. Leonidas
>Professor in Biochemistry
>Department of Biochemistry & Biotechnology
>University of Thessaly
>Biopolis 41500 Larissa, Greece
>---------------------------------------------
>Tel. +302410 565278
>Tel. +302410 565297 (Lab)
>Tel. +304210 565263 (X-ray)
>Fax. +302410 565290
>E-mail: ddleoni...@bio.uth.gr
>ORCID ID orcid.org/0000-0002-3874-2523
>-----------------------------------------------
>
>
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