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gzcat (or gunzip -c)

 
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# 1  
Old 06-23-2006
gzcat (or gunzip -c)
Does anyone know what kind of impact gunzip -c or gzcat has on a system? I am using gunzip -c on files that around 30 Mb compressed and 300Mb uncompressed. How much memory or disk space gets used? Also does anyone know how gunzip -c actually works? The system I am running on is AIX Version 5.

Here is the line that I am using:

gunzip -c <filename> | grep -ic <search_terms>

Thanks
# 2  
Old 06-26-2006
I highly doubt anyone knows this answer off the top of their head. Why don't you open top or topas in another window and monitor the gunzip command to see for yourself? The following is output from running topas. This isn't the best way to measure but since noone has replied I thought I would give you a place to start.

Topas Monitor for host: xsa00831
Mon Jun 26 10:31:16 2006 Interval: 2

Kernel 1.5 |# |
User 0.4 |# |
Wait 0.0 | |
Idle 98.1 |############################|

Network KBPS I-Pack O-Pack KB-In KB-Out
en0 0.7 3.5 2.0 0.2 0.5
en3 0.4 4.0 1.0 0.3 0.1
en2 0.1 3.0 0.0 0.1 0.0
lo0 0.1 1.0 1.0 0.0 0.0

Disk Busy% KBPS TPS KB-Read KB-Writ
hdisk2 0.0 0.0 0.0 0.0 0.0
hdisk0 0.0 0.0 0.0 0.0 0.0
hdisk1 0.0 0.0 0.0 0.0 0.0
hdisk98 0.0 0.0 0.0 0.0 0.0
hdisk106 0.0 0.0 0.0 0.0 0.0
hdisk113 0.0 0.0 0.0 0.0 0.0
hdisk37 0.0 0.0 0.0 0.0 0.0
hdisk102 0.0 0.0 0.0 0.0 0.0
hdisk103 0.0 0.0 0.0 0.0 0.0
hdisk120 0.0 0.0 0.0 0.0 0.0
hdisk122 0.0 0.0 0.0 0.0 0.0
hdisk104 0.0 0.0 0.0 0.0 0.0
hdisk119 0.0 0.0 0.0 0.0 0.0
hdisk108 0.0 0.0 0.0 0.0 0.0
hdisk101 0.0 0.0 0.0 0.0 0.0
hdisk99 0.0 0.0 0.0 0.0 0.0
hdisk110 0.0 0.0 0.0 0.0 0.0
hdisk111 0.0 0.0 0.0 0.0 0.0
hdisk114 0.0 0.0 0.0 0.0 0.0
hdisk109 0.0 0.0 0.0 0.0 0.0

Name PID CPU% PgSp Owner
batchman 43242 0.1 1.4 maestro
pdosaudi 39476 0.1 3.1 root
mstragen 49096 0.1 1.9 root
getty 24944 0.1 0.5 root
iravcol 21708 0.1 3.0 root
mstragen 36460 0.1 1.0 root
syncd 14110 0.0 0.6 root
irmultic 26840 0.0 5.4 root
tecad_lo 34066 0.0 1.4 root
IBM.Host 27870 0.0 1.5 root
dtgreet 19698 0.0 1.7 root
pdosd 38216 0.0 8.7 root
irmultic 23024 0.0 2.6 root
hatsd 26188 0.0 6.3 root
dsmc 27166 0.0 13.3 root
hats_rs2 35094 0.0 1.0 root
maragent 47302 0.0 9.0 root
gil 10320 0.0 0.1 root
hats_nim 35616 0.0 1.0 root
hats_nim 32552 0.0 1.0 root
IBM.CSMA 30724 0.0 1.7 root
clstrmgr 37686 0.0 2.4 root
PD2 16028 0.0 0.0 root
irnetrtr 25824 0.0 18.1 root
clcomd 34334 0.0 1.3 root

EVENTS/QUEUES FILE/TTY
Cswitch 510 Readch 1476.5K
Syscall 4393 Writech 280
Reads 394 Rawin 0
Writes 1 Ttyout 231
Forks 0 Igets 0
Execs 0 Namei 5
Runqueue 0.0 Dirblk 0
Waitqueue 0.0

PAGING MEMORY
Faults 0 Real,MB 8191
Steals 0 % Comp 8.2
PgspIn 0 % Noncomp 8.9
PgspOut 0 % Client 0.5
PageIn 0
PageOut 16 PAGING SPACE
Sios 16 Size,MB 9216
% Used 0.5
NFS (calls/sec) % Free 99.4
ServerV2 0
ClientV2 0 Press:
ServerV3 0 "h" for help
ClientV3 0 "q" to quit



-X
 
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