Re: Παράξενες καθυστερήσεις όταν γράφω στο δίσκο
Nick Demou
ndemou at gmail.com
Tue Mar 13 00:40:49 EET 2012
πολύ πιο εκτενή στοιχεία από το atop για το τι γίνετε στο σύστημα σου θα
δεις με την dstat (π.χ. dstat -a -m --io --fs -f). Σύγκρινε με κάποιο άλλο
σύστημα για να έχεις μια αίσθηση. Αν μου δώσεις έτοιμο script (όπως π.χ.
παρακάτω) να το τρέξω για χάρη σου (μην ξεχάσεις το cleanup των αρχείων)
Π.χ. σε ένα άλλο σύστημα αυτή τη φορά με RAID 1:
*οι εντολές*
mkdir /tmp/kara.temp ; mkdir /home/ndemou/kara.temp; echo creating files;
date; for i in {1..10000}; do dd if=/dev/zero of=/tmp/kara.temp/pipi$i
bs=19000 count=1 > /dev/null 2>&1; done; date ; echo copying files ; time
cp /tmp/kara.temp/* /home/ndemou/kara.temp; echo cleaning; date; rm -rf
/tmp/kara.temp; rm -rf /home/ndemou/kara.temp/; date; echo done
creating files
Tue Mar 13 00:31:14 EET 2012
Tue Mar 13 00:31:37 EET 2012
copying files
real 0m2.192s
user 0m0.332s
sys 0m0.812s
cleaning
Tue Mar 13 00:31:39 EET 2012
Tue Mar 13 00:31:40 EET 2012
done
*και η εικόνα του συστήματος από την dstat -t -a -m καθώς εκτελούνται τα
παραπάνω:*
$ dstat -t -a -m
-----time----- ----total-cpu-usage---- -dsk/total- -net/total- ---paging--
---system-- ------memory-usage-----
date/time |usr sys idl wai hiq siq| read writ| recv send| in out |
int csw | used buff cach free
13-03 00:31:02| 1 0 99 0 0 0| 0 0 |2388B 20k| 0 0 |
376 304 | 459M 179M 751M 528M
13-03 00:31:03| 0 0 100 0 0 0| 0 0 |3126B 3866B| 0 0 |
128 239 | 459M 179M 751M 528M
13-03 00:31:04| 0 0 100 0 0 0| 0 0 |1530B 2112B| 0 0 |
106 182 | 459M 179M 751M 528M
13-03 00:31:05| 0 0 100 0 0 0| 0 0 | 852B 1500B| 0 0
| 83 155 | 459M 179M 751M 528M
13-03 00:31:06| 0 0 100 0 0 0| 0 0 | 966B 1966B| 0 0
| 89 177 | 459M 179M 751M 528M
13-03 00:31:07| 3 0 97 0 0 0| 0 0 |1512B 13k| 0 0 |
253 210 | 459M 179M 751M 528M
13-03 00:31:08| 3 0 97 0 0 0| 0 0 |1398B 18k| 0 0 |
358 271 | 459M 179M 751M 528M
13-03 00:31:09| 0 0 100 0 0 0| 0 0 | 606B 858B| 0 0
| 73 134 | 459M 179M 751M 528M
13-03 00:31:10| 0 0 100 0 0 0| 0 0 | 918B 972B| 0 0
| 92 164 | 459M 179M 751M 528M
13-03 00:31:11| 0 0 100 0 0 0| 0 0 | 786B 972B| 0 0
| 74 131 | 459M 179M 751M 528M
13-03 00:31:12| 0 0 100 0 0 0| 0 0 | 132B 516B| 0 0
| 75 122 | 459M 179M 751M 528M
13-03 00:31:13| 1 0 98 0 0 0| 0 112k| 846B 12k| 0 0 |
241 196 | 459M 179M 751M 528M
13-03 00:31:14| 7 0 93 0 0 0| 0 0 |1458B 18k| 0 0 |
386 481 | 459M 179M 752M 528M
13-03 00:31:15| 12 17 70 0 1 0| 0 0 | 545B 703B| 0 0 |
404 3936 | 459M 179M 760M 519M
13-03 00:31:16| 16 16 68 0 0 0| 0 0 | 132B 516B| 0 0 |
393 3908 | 459M 179M 768M 511M
13-03 00:31:17| 16 14 71 0 0 0| 0 0 | 132B 402B| 0 0 |
392 3911 | 459M 179M 777M 503M
13-03 00:31:18| 16 12 72 0 0 0| 0 0 | 66B 418B| 0 0 |
388 3956 | 460M 179M 785M 494M
13-03 00:31:19| 19 15 67 0 0 0| 0 0 | 666B 12k| 0 0 |
524 3880 | 461M 179M 793M 484M
13-03 00:31:20| 23 16 61 0 0 0| 0 0 |1152B 18k| 0 0 |
607 4048 | 460M 179M 802M 476M
13-03 00:31:21| 14 17 70 0 0 0| 0 0 | 66B 532B| 0 0 |
395 3895 | 461M 179M 810M 467M
13-03 00:31:22| 16 15 69 0 0 0| 0 0 | 440B 402B| 0 0 |
390 3912 | 461M 179M 819M 459M
13-03 00:31:23| 14 14 72 0 0 0| 0 0 | 338B 532B| 0 0 |
391 3945 | 462M 179M 827M 450M
13-03 00:31:24| 16 14 70 0 0 0| 0 0 | 660B 402B| 0 0 |
395 3927 | 462M 179M 835M 441M
13-03 00:31:25| 20 14 66 0 0 0| 0 0 | 938B 10k| 0 0 |
509 3909 | 464M 179M 844M 432M
13-03 00:31:26| 19 18 64 0 0 0| 0 0 |1590B 19k| 0 0 |
636 3947 | 463M 179M 852M 423M
-----time----- ----total-cpu-usage---- -dsk/total- -net/total- ---paging--
---system-- ------memory-usage-----
date/time |usr sys idl wai hiq siq| read writ| recv send| in out |
int csw | used buff cach free
13-03 00:31:27| 13 17 71 0 0 0| 0 0 | 158B 418B| 0 0 |
391 3929 | 463M 179M 860M 415M
13-03 00:31:28| 15 16 69 0 0 0| 0 0 | 158B 1122B| 0 0 |
391 3908 | 464M 179M 869M 406M
13-03 00:31:29| 14 13 73 0 0 0| 0 0 | 66B 418B| 0 0 |
389 3948 | 465M 179M 877M 397M
13-03 00:31:30| 16 14 70 0 0 0| 0 0 | 374B 418B| 0 0 |
388 3931 | 465M 179M 885M 388M
13-03 00:31:31| 17 15 68 0 0 0| 0 0 | 758B 7558B| 0 0 |
482 3916 | 467M 179M 893M 378M
13-03 00:31:32| 22 17 62 0 0 0| 0 0 |1238B 22k| 0 0 |
649 3916 | 466M 179M 902M 371M
13-03 00:31:33| 16 14 71 0 0 0| 0 0 | 246B 532B| 0 0 |
395 3941 | 467M 179M 910M 362M
13-03 00:31:34| 16 15 70 0 0 0| 0 0 | 312B 402B| 0 0 |
396 3921 | 467M 179M 918M 353M
13-03 00:31:35| 17 14 69 0 0 0| 0 0 | 646B 532B| 0 0 |
393 3906 | 468M 179M 927M 344M
13-03 00:31:36| 16 15 69 0 0 0| 0 0 | 224B 402B| 0 0 |
395 3926 | 468M 179M 935M 335M
13-03 00:31:37| 16 15 69 0 0 0| 0 0 | 66B 418B| 0 0 |
386 3850 | 469M 179M 943M 327M
13-03 00:31:38| 26 16 51 7 1 0| 0 43M|1878B 28k| 0 0
|1176 2092 | 476M 179M 1005M 258M
13-03 00:31:39| 1 19 30 49 0 2| 0 145M| 284B 1236B| 0 0
|1672 755 | 480M 179M 1085M 174M
13-03 00:31:40| 2 24 47 26 0 1| 0 160M| 330B 1228B| 0 0 |
767 456 | 460M 179M 748M 530M
13-03 00:31:41| 0 0 100 0 0 0| 0 16k| 312B 582B| 0 0
| 65 113 | 460M 179M 748M 530M
13-03 00:31:42| 0 0 100 0 0 0| 0 0 | 66B 516B| 0 0
| 70 127 | 460M 179M 748M 530M
13-03 00:31:43| 0 0 100 0 0 0| 0 0 | 66B 516B| 0 0
| 56 108 | 460M 179M 748M 530M
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