"No more memory "
- To: mathgroup at smc.vnet.net
- Subject: [mg30165] "No more memory "
- From: zosi <zosi at to.infn.it>
- Date: Wed, 1 Aug 2001 02:19:20 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
Hi,
We are working with the Takagi equations
(see attached simplified notebook).
To avoid the following Mathematica message
"No more memory available
Mathematica kernel has shut down
Try quitting other applications and try again"
we have updated our platform which now is
1 GB RAM, 2 GB swap, 23 GB free HD
Version 4.1
Linux RedHat 7.1, Kernel 2.4.2-2
Unfortunately, we meet the same message when we set
(in NDSolve in our nb)
AccuracyGoal -> 25
PrecisionGoal -> 25
WorkingPrecision -> 30
MaxSteps -> 500000 and
Zmax = 0.000800 ( 800 micrometers)
If we reduce Zmax (e.g. Zmax = 0.000400) it works.
Our question is: How can we avoid the message
"No more memory available" ?
For patient and kind people we annexe the summary
of the results shown by the "top" Linux command.
Any interested people can contact us directly.
Many thanks for any suggestion.
Gianfranco ZOSI
Dip Fisica Generale "A. Avogadro"
Universita di Torino
v. P. Giuria 1 - 10125 - Italy
ph + 39 011 670 7426
**** ANNEXE *****
At the beginning we have
Start Phase 1
3:48pm up 3:36, 4 users, load average: 2.19, 1.94, 2.24
2 processes: 1 sleeping, 1 running, 0 zombie, 0 stopped
CPU states: 37.5% user, 32.1% system, 0.0% nice, 30.3% idle
Mem: 1028792K av, 174788K used, 854004K free, <-------
Swap: 2096440K av, 4K used, 2096436K free, 73712K cached <-------
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
32614 zosi 9 0 5304 5304 2900 S 0.0 0.5 0:01 Mathematica
2158 zosi 19 0 22124 21M 2572 R 53.3 2.1 0:19 MathKernel
---
3:49pm up 3:37, 4 users, load average: 2.54, 2.07, 2.27
2 processes: 1 sleeping, 1 running, 0 zombie, 0 stopped
CPU states: 73.4% user, 26.5% system, 0.0% nice, 0.0% idle
Mem: 1028792K av, 203496K used, 825296K free, <-------
Swap: 2096440K av, 4K used, 2096436K free, 73716K cached <-------
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
32614 zosi 9 0 5332 5332 2928 S 0.0 0.5 0:01 Mathematica
2158 zosi 20 0 790M 790M 2572 R 53.9 78.6 14:47 MathKernel
In Phase 1 the used Mem raises regularly until the Mem is saturated
as apperas in the following Phase 2
********************* Phase 2
4:16pm up 4:04, 4 users, load average: 2.88, 2.89, 2.72
2 processes: 1 sleeping, 1 running, 0 zombie, 0 stopped
CPU states: 74.3% user, 25.6% system, 0.0% nice, 0.0% idle
Mem: 1028792K av, 991644K used, 37148K free,
Swap: 2096440K av, 4K used, 2096436K free, 73736K cached
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
32614 zosi 9 0 5332 5332 2928 S 0.0 0.5 0:01 Mathematica
2158 zosi 15 0 818M 818M 2572 R 53.9 81.5 15:20 MathKernel
---
4:17pm up 4:05, 4 users, load average: 2.99, 2.92, 2.74
2 processes: 1 sleeping, 1 running, 0 zombie, 0 stopped
CPU states: 76.4% user, 23.5% system, 0.0% nice, 0.0% idle
Mem: 1028792K av, 1020736K used, 8056K free,
Swap: 2096440K av, 4K used, 2096436K free, 73736K cached
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
32614 zosi 9 0 5332 5332 2928 S 0.0 0.5 0:01 Mathematica
2158 zosi 20 0 847M 847M 2572 R 54.0 84.3 15:52 MathKernel
We remark here, from 4:17 to 4:18pm, a jump of the swap area;
the used swap area raises mildly and does not saturate
the total 2 GB swap area
4:18pm up 4:06, 4 users, load average: 2.79, 2.87, 2.73
2 processes: 1 sleeping, 1 running, 0 zombie, 0 stopped
CPU states: 70.2% user, 29.7% system, 0.0% nice, 0.0% idle
Mem: 1028792K av, 1024308K used, 4484K free, <--------
Swap: 2096440K av, 890816K used, 1205624K free, 941940K cached <-------- jump
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
32614 zosi 9 0 2404 4 4 S 0.0 0.0 0:01 Mathematica
2158 zosi 19 0 874M 34M 436 R 50.0 3.4 16:22 MathKernel
4:19pm up 4:07, 4 users, load average: 2.78, 2.85, 2.73
2 processes: 1 sleeping, 1 running, 0 zombie, 0 stopped
CPU states: 73.0% user, 26.9% system, 0.0% nice, 0.0% idle
Mem: 1028792K av, 1024104K used, 4688K free,
Swap: 2096440K av, 890816K used, 1205624K free, 928764K cached
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
32614 zosi 9 0 2552 328 284 S 0.0 0.0 0:02 Mathematica
2158 zosi 20 0 1243M 241M 436 R 39.2 24.0 22:47 MathKernel
---
4:34pm up 4:22, 4 users, load average: 4.26, 3.86, 3.27
2 processes: 1 sleeping, 1 running, 0 zombie, 0 stopped
CPU states: 50.6% user, 49.3% system, 0.0% nice, 0.0% idle
Mem: 1028792K av, 1025136K used, 3656K free,
Swap: 2096440K av, 1102668K used, 993772K free, 784808K cached
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
32614 zosi 9 0 2456 232 188 S 0.0 0.0 0:02 Mathematica
2158 zosi 20 0 1263M 216M 436 R 35.0 21.5 23:08 MathKernel
---
4:35pm up 4:23, 4 users, load average: 4.39, 3.96, 3.34
2 processes: 1 sleeping, 1 running, 0 zombie, 0 stopped
CPU states: 57.7% user, 42.2% system, 0.0% nice, 0.0% idle
Mem: 1028792K av, 1024916K used, 3876K free,
Swap: 2096440K av, 1103460K used, 992980K free, 762540K cached
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
32614 zosi 9 0 2404 4 4 S 0.0 0.0 0:02 Mathematica
2158 zosi 14 0 1394M 246M 436 R 37.0 24.5 25:27 MathKernel
************ (MathKernel lost) Phase 3 <-------
In the following phase the MathKernel disappears
4:41pm up 4:29, 4 users, load average: 4.04, 4.13, 3.61
1 processes: 1 sleeping, 0 running, 0 zombie, 0 stopped
CPU states: 37.8% user, 62.1% system, 0.0% nice, 0.0% idle
Mem: 1028792K av, 803984K used, 224808K free,
Swap: 2096440K av, 798372K used, 1298068K free, 785628K cached
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
32614 zosi 8 0 4036 2928 2276 S 0.5 0.2 0:02 Mathematica
---
4:42pm up 4:30, 4 users, load average: 3.18, 3.86, 3.55
1 processes: 1 sleeping, 0 running, 0 zombie, 0 stopped
CPU states: 37.9% user, 62.0% system, 0.0% nice, 0.0% idle
Mem: 1028792K av, 804364K used, 224428K free,
Swap: 2096440K av, 798372K used, 1298068K free, 786172K cached
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
32614 zosi 8 0 4036 2928 2276 S 0.0 0.2 0:02 Mathematica
---
4:55pm up 4:43, 4 users, load average: 2.42, 2.64, 2.96
1 processes: 1 sleeping, 0 running, 0 zombie, 0 stopped
CPU states: 38.1% user, 61.8% system, 0.0% nice, 0.0% idle
Mem: 1028792K av, 806696K used, 222096K free,
Swap: 2096440K av, 798312K used, 1298128K free, 788484K cached
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
32614 zosi 8 0 4036 2928 2276 S 0.0 0.2 0:02 Mathematica
and after nearly one hour (from 3:48 to 4:55pm)
the message "No more memory" appears, even though the swap area is NOT saturated <-------
Final comment. We have also remarked that SOMETIMES quitting Mathematica
does not clear the used Mem area; in these cases
the message "No more memory" appears quite soon
Here is the notebook containing the NDSolve command.
In this case we know the analytical solution.
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