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100%
When I/O workloads don't perform
02.08.2021
Home »  Archive  »  2021  »  Issue 64: Bare...  » 
Lead Image © Viacheslav Iakobchuk, 123RF.com
r/s w/s rkB/s wkB/s rrqm/s wrqm/s %rrqm %wrqm r_await w_await aqu-sz rareq-sz wareq-sz svctm %util sda 0.00 9.00 0.00 88.00 0.00 8.00 0.00 47
99%
When I/O Workloads Don’t Perform
12.05.2021
Home »  HPC  »  Articles  » 
_await w_await aqu-sz rareq-sz wareq-sz  svctm  %util sda              0.00    9.00      0.00     88.00     0.00     8.00   0.00  47.06    0.00   30.83   0.26     0.00     9.78   0.67   0.60 nvme0n1
94%
Rethinking RAID (on Linux)
16.03.2021
Home »  HPC  »  Articles  » 
=libaio, iodepth=32 fio-3.12 Starting 1 process Jobs: 1 (f=1): [w(1)][100.0%][w=1420KiB/s][w=355 IOPS][eta 00m:00s] test: (groupid=0, jobs=1): err= 0: pid=3377: Sat Jan  9 15:31:04 2021   write: IOPS=352, BW=1410Ki
85%
Rethinking RAID (on Linux)
25.03.2021
Home »  Archive  »  2021  »  Issue 62: Lean...  » 
Lead Image © nikkikii, 123RF.com
=libaio, iodepth=32 fio-3.12 Starting 1 process Jobs: 1 (f=1): [w(1)][100.0%][w=1420KiB/s][w=355 IOPS][eta 00m:00s] test: (groupid=0, jobs=1): err= 0: pid=3377: Sat Jan 9 15:31:04 2021 write: IOPS=352, BW=1410Ki ... Madam, I'm mdadm
80%
Monitoring Storage with iostat
25.02.2013
Home »  HPC  »  Articles  » 
/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await r_await w_await svctm %util md1 0.00 0.00 0.04 0.05 0.00 0.00 8.17 0.00 0.00 0.00 0.00 0.00
80%
Listing 2
01.08.2012
Home »  HPC  »  Articles  »  Warewulf Cluste...  »  Warewulf 3 Code  » 
 
                                                                        | 308 kB     00:00      (2/12): fontconfig-2.8.0-3.el6.x86_64.rpm                                                                     | 185 kB     00:00      (3/12): freetype-2.3.11-6.el6_2.9.x86_64.rpm
80%
Profiling Python code
30.01.2020
Home »  Archive  »  2020  »  Issue 55: AWS L...  » 
Lead Image ©-Yong Hian Lim, Fotolia.com
# Update velocities 139 200 99.0 0.5 0.0 for i in range(0, d_num): 140 75150 29909.0 0.4 8.2 for j in range(0, p_num): 141 75000
79%
Filesystem Murder Mystery
09.04.2019
Home »  Archive  »  2019  »  Issue 50: Bpfilter  » 
Lead Image © Lucy Baldwin, 123RF.com
in mv ubuntu@aws:~/slow-mv$ strace -t mv 3GB.copy 3GB 19:00:09 execve("/bin/mv", ["mv", "3GB.copy", "3GB"], 0x7ffd0e7dddf8 /* 21 vars */) = 0 19:00:09 brk(NULL) = 0x55cd7d1ce000
77%
Profiling Python Code
09.12.2019
Home »  HPC  »  Articles  » 
%|    154|  12724500|      46.7333|   3.6727e-06|  3.09%|                d = 0.0    155|  50898000|      195.426|  3.83956e-06| 12.94%|                for k in range(0, d_num):    156
74%
Parallel Programming with OpenMP
21.11.2012
Home »  HPC  »  Articles  » 
hand side of unit square: (E) 107 DO j=1,m 108 u(m,j) = 0.0d0 109 ENDDO 110 111 ! Left hand side of unit square: (W) 112 DO i=1,m 113 u(1,j) = 0.0d0 114 ENDDO 115 116 ! 117 ! Solution

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