SCO Open Sources System Activity Reporter
diabloii writes "SCO will license its System Activity Reporter (SAR) source code to the open source community in cooperation with Starnix, Inc. SAR is currently used to retrieve data for administering the UnixWare 7 System V Release 5 (SVR5)
kernel. SCO is hoping that the release of SAR will help standardize kernel administrative. Read the press release here. Also more info at freshmeat. " SAR will be released under the Mozilla license, under the 2nd phase of the release. In the first phase, it will be ported to *BSD and Linux, with the help of Starnix.
From the OSAR web page, it seems like this provides a portable way of collecting performance data. There has got to be more to this than just getting the system load. Anybody know/use SAR? What goodies does it have?
This will surely good for just about all Unix and Linux standardisation efforts, including the LSB. I wonder what the LSB people say about this (if they're awake at this moment), but this seems to me like it will add a little bit more commonality between the various Unix flavours out there. We still have a long way, though. Having a bunch of non-standard-compliant libraries doesn't help much.
Be cautioned, though: Microsoft owns a good-sized chunk of SCO.
In Soviet Russia, Jesus asks: "What Would You Do?"
I'm not sure I understand why this is a big deal? Seems just about anyone could write up a sar clone in a couple of days just by pulling some info from /proc.
well for the most part your right but what you seem to be missing is the fact that nobody has done it yet. sar is a nice little tool and certainly more usefull than you're trying to mislead ppl in to believing. i for one am thankfull that this is happening, having standard tools like this that you can use on any platform makes everybodies lives easyer.
Except that it wouldn't be Linux and we could all sue for false advertising, and Linus would assert his trademark power..
Hmmm...
I reserve a cautious optimism about this development.
On the one hand, I'll take any contributions to the pool of open source software we can get, provided it's worth something. I'm not aware of any really decent open source performance monitoring packages previously available so this package may prove interesting.
OTOH, SCO is not famous for being particularly friendly to Open Source concepts, and as others have pointed out, something like 25% of them is owned by Microsoft.
It's interesting that this announcement is being made by a company who's CEO, Doug Michels, has been known to have done some truly venomous FUD spewing about Linux in the past. He has also claimed that the supposed venomous FUD spewing was actually a result of the press misquoting him or quoting him out of context.
Maybe it's true that SCO has some respect for the open source concept and the press WAS misquoting Michels on these occasions. It wouldn't be the first time that the press tried to artificially give the impression of a conflict.
This development may or may not be evidence of SCO's real attitude toward open source. Time will tell, and this is a development worth watching.
But frankly, Sun's SAR is better. Linux needs SAR though - very badly.
...Steve
support support 3.2v5.0.2 Pentium 06/14/99
00:00:01 %usr %sys %wio %idle
01:00:00 0 0 0 100
02:00:00 0 0 0 100
03:00:01 0 0 0 100
04:00:01 0 0 0 100
05:00:00 0 0 0 100
06:00:00 0 0 0 100
07:00:00 0 0 0 100
08:03:03 unix restarts
08:20:00 0 2 2 96
08:40:00 0 1 6 92
09:00:01 0 0 0 99
09:20:00 1 0 0 98
09:40:00 2 2 4 91
10:00:00 0 0 0 99
10:20:00 2 1 0 97
10:40:01 2 0 0 98
11:00:00 1 0 0 98
11:20:00 0 0 0 99
Average 0 0 0 99
00:00:01 bread/s lread/s %rcache bwrit/s lwrit/s %wcache pread/s pwrit/s
01:00:00 0 2 98 0 0 88 0 0
02:00:00 0 2 100 0 0 90 0 0
03:00:01 0 2 100 0 0 90 0 0
04:00:01 0 2 99 0 0 89 0 0
05:00:00 0 2 100 0 0 90 0 0
06:00:00 0 2 100 0 0 89 0 0
07:00:00 0 2 100 0 0 86 0 0
08:03:03 unix restarts
08:20:00 10 70 85 2 8 70 0 0
08:40:00 11 161 93 3 6 58 0 0
09:00:01 0 8 97 0 2 70 0 0
09:20:00 2 21 89 1 5 72 0 0
09:40:00 32 208 84 27 71 62 0 0
10:00:00 0 8 98 0 2 78 0 0
10:20:00 0 30 97 1 9 84 0 0
10:40:01 3 12 73 0 3 74 0 0
11:00:00 0 4 99 0 1 81 0 0
11:20:00 0 3 99 0 1 82 0 0
Average 2 18 89 1 4 69 0 0
00:00:01 device %busy avque r+w/s blks/s avwait avserv
01:00:00 Sdsk-0 0.13 1.00 0.13 0.27 0.00 9.44
02:00:00 Sdsk-0 0.00 1.00 0.09 0.18 0.00 0.03
03:00:01
04:00:01 Sdsk-0 0.01 1.00 0.11 0.23 0.00 0.55
05:00:00
06:00:00 Sdsk-0 0.00 1.00 0.09 0.20 0.00 0.26
07:00:00
08:03:03 unix restarts
08:20:00 Sdsk-0 10.64 1.23 4.93 24.54 4.95 21.57
08:40:00 Sdsk-0 6.25 1.17 10.99 26.36 0.97 5.69
09:00:01 Sdsk-0 0.12 1.00 0.56 1.55 0.00 2.16
09:20:00 Sdsk-0 0.52 1.04 1.88 7.08 0.12 2.75
09:40:00 Sdsk-0 5.58 1.54 12.04 118.17 2.50 4.64
10:00:00 Sdsk-0 0.09 1.05 0.44 1.12 0.09 2.01
10:20:00 Sdsk-0 0.29 1.07 1.69 4.71 0.12 1.69
10:40:01 Sdsk-0 0.44 1.09 1.62 8.09 0.24 2.73
11:00:00 Sdsk-0 0.01 1.00 0.21 0.51 0.00 0.51
11:20:00 Sdsk-0 0.04 1.00 0.19 0.43 0.00 1.97
Average Sdsk-0 0.74 1.27 1.14 6.21 1.77 6.49
00:00:01 H_hits Hmisses (%Hhit) D_hits Dmisses (%Dhit)
01:00:00 18432 286 ( 98%) 0 0 ( 0%)
02:00:00 18328 274 ( 98%) 0 0 ( 0%)
03:00:01 18316 274 ( 98%) 0 0 ( 0%)
04:00:01 20533 574 ( 97%) 0 0 ( 0%)
05:00:00 18271 271 ( 98%) 0 0 ( 0%)
06:00:00 18831 314 ( 98%) 0 0 ( 0%)
07:00:00 24369 669 ( 97%) 0 0 ( 0%)
08:03:03 unix restarts
08:20:00 115101 10367 ( 91%) 0 0 ( 0%)
08:40:00 23248 12277 ( 65%) 0 0 ( 0%)
09:00:01 22807 1241 ( 94%) 0 0 ( 0%)
09:20:00 54671 2620 ( 95%) 0 0 ( 0%)
09:40:00 91269 6396 ( 93%) 0 0 ( 0%)
10:00:00 19734 1386 ( 93%) 0 0 ( 0%)
10:20:00 70310 2626 ( 96%) 0 0 ( 0%)
10:40:01 35183 1300 ( 96%) 0 0 ( 0%)
11:00:00 11170 491 ( 95%) 0 0 ( 0%)
11:20:00 10449 374 ( 96%) 0 0 ( 0%)
Average 59102 4174 ( 93%) 0 0 ( 0%)
00:00:01 rawch/s canch/s outch/s rcvin/s xmtin/s mdmin/s
01:00:00 0 0 0 0 0 0
02:00:00 0 0 0 0 0 0
03:00:01 0 0 0 0 0 0
04:00:01 0 0 0 0 0 0
05:00:00 0 0 0 0 0 0
06:00:00 0 0 0 0 0 0
07:00:00 0 0 0 0 0 0
08:03:03 unix restarts
08:20:00 2 0 53 0 0 0
08:40:00 3 0 56 0 0 0
09:00:01 5 0 51 0 0 0
09:20:00 0 0 46 0 0 0
09:40:00 0 0 185 0 0 0
10:00:00 2 0 27 0 0 0
10:20:00 5 0 216 0 0 0
10:40:01 3 0 70 0 0 0
11:00:00 0 0 2 0 0 0
11:20:00 0 0 7 0 0 0
Average 0 0 23 0 0 0
00:00:01 scall/s sread/s swrit/s fork/s exec/s rchar/s wchar/s
01:00:00 44 4 3 0.01 0.01 789 80
02:00:00 44 4 3 0.01 0.01 787 80
03:00:01 44 4 3 0.01 0.01 786 80
04:00:01 44 4 3 0.01 0.01 794 80
05:00:00 44 4 3 0.01 0.01 788 80
06:00:00 44 4 3 0.01 0.01 791 80
07:00:00 45 4 3 0.02 0.02 827 80
08:03:03 unix restarts
08:20:00 143 24 7 0.42 0.49 7883 1150
08:40:00 141 8 4 0.06 0.05 1406 174
09:00:01 67 11 5 0.06 0.04 1567 242
09:20:00 86 10 5 0.10 0.10 3862 441
09:40:00 167 18 33 0.05 0.06 33814 24821
10:00:00 60 7 4 0.04 0.07 1739 133
10:20:00 112 21 10 0.08 0.08 5043 941
10:40:01 87 13 6 0.04 0.05 2723 1044
11:00:00 77 5 5 0.02 0.02 1100 2260
11:20:00 74 6 4 0.03 0.02 1012 1035
Average 62 7 4 0.03 0.04 2452 1094
00:00:01 swpin/s bswin/s swpot/s bswot/s pswch/s
01:00:00 0.00 0.0 0.00 0.0 9
02:00:00 0.00 0.0 0.00 0.0 9
03:00:01 0.00 0.0 0.00 0.0 9
04:00:01 0.00 0.0 0.00 0.0 9
05:00:00 0.00 0.0 0.00 0.0 9
06:00:00 0.00 0.0 0.00 0.0 9
07:00:00 0.00 0.0 0.00 0.0 9
08:03:03 unix restarts
08:20:00 0.00 0.0 0.00 0.0 20
08:40:00 0.00 0.0 0.00 0.0 23
09:00:01 0.00 0.0 0.00 0.0 15
09:20:00 0.00 0.0 0.00 0.0 15
09:40:00 0.00 0.0 0.00 0.0 31
10:00:00 0.00 0.0 0.00 0.0 12
10:20:00 0.00 0.0 0.00 0.0 21
10:40:01 0.00 0.0 0.00 0.0 18
11:00:00 0.00 0.0 0.00 0.0 12
11:20:00 0.00 0.0 0.00 0.0 13
Average 0.00 0.0 0.00 0.0 12
00:00:01 iget/s namei/s dirbk/s
01:00:00 5 1 0
02:00:00 5 1 0
03:00:01 5 1 0
04:00:01 6 1 0
05:00:00 5 1 0
06:00:00 5 1 0
07:00:00 7 1 0
08:03:03 unix restarts
08:20:00 116 21 41
08:40:00 71 59 104
09:00:01 19 3 4
09:20:00 46 7 10
09:40:00 112 42 65
10:00:00 17 3 5
10:20:00 60 8 11
10:40:01 30 4 5
11:00:00 9 2 2
11:20:00 9 2 1
Average 19 6 8
00:00:01 runq-sz %runocc swpq-sz %swpocc
01:00:00 1.0 0
02:00:00 1.0 3
03:00:01 3.0 1
04:00:01 3.0 0
05:00:00
06:00:00 2.0 0
07:00:00
08:03:03 unix restarts
08:20:00 2.9 6
08:40:00 1.2 2
09:00:01 1.0 1
09:20:00 1.2 2
09:40:00 1.1 5
10:00:00
10:20:00 1.3 4
10:40:01 1.3 2
11:00:00
11:20:00 2.0 0
Average 1.6 19
00:00:01 proc-sz ov inod-sz ov file-sz ov lock-sz
01:00:00 73/ 95 0 294/1126 0 276/ 341 0 4/ 128
02:00:00 73/ 95 0 294/1126 0 276/ 341 0 4/ 128
03:00:01 71/ 95 0 292/1126 0 274/ 341 0 4/ 128
04:00:01 73/ 95 0 294/1228 0 276/ 341 0 4/ 128
05:00:00 73/ 95 0 295/1228 0 277/ 341 0 4/ 128
06:00:00 73/ 95 0 295/1228 0 277/ 341 0 4/ 128
07:00:00 72/ 95 0 294/1228 0 276/ 341 0 4/ 128
08:03:03 unix restarts
08:20:00 84/ 95 0 350/ 870 0 326/ 341 0 11/ 128
08:40:00 82/ 95 0 347/ 870 0 322/ 341 0 10/ 128
09:00:01 82/ 95 0 345/ 870 0 321/ 341 0 11/ 128
09:20:00 85/ 95 0 354/ 870 0 331/ 682 0 11/ 128
09:40:00 83/ 95 0 352/1894 0 328/ 682 0 11/ 128
10:00:00 89/ 95 0 366/1894 0 342/ 682 0 11/ 128
10:20:00 88/ 95 0 360/1894 0 334/ 682 0 11/ 128
10:40:01 90/ 95 0 365/1894 0 341/ 682 0 11/ 128
11:00:00 89/ 95 0 363/1894 0 339/ 682 0 11/ 128
11:20:00 89/ 95 0 363/1894 0 340/ 682 0 11/ 128
00:00:01 msg/s sema/s
01:00:00 0.00 0.01
02:00:00 0.00 0.00
03:00:01 0.00 0.00
04:00:01 0.00 0.00
05:00:00 0.00 0.00
06:00:00 0.00 0.00
07:00:00 0.00 0.00
08:03:03 unix restarts
08:20:00 0.00 0.04
08:40:00 0.00 0.00
09:00:01 0.00 0.00
09:20:00 0.01 0.00
09:40:00 0.00 0.00
10:00:00 0.00 0.00
10:20:00 0.01 0.00
10:40:01 0.00 0.00
11:00:00 0.00 0.00
11:20:00 0.00 0.00
Average 0.00 0.00
00:00:01 vflt/s pflt/s pgfil/s rclm/s
01:00:00 0.06 0.18 0.00 0.00
02:00:00 0.06 0.18 0.00 0.00
03:00:01 0.06 0.18 0.00 0.00
04:00:01 0.08 0.27 0.00 0.00
05:00:00 0.06 0.18 0.00 0.00
06:00:00 0.06 0.21 0.00 0.00
07:00:00 0.13 0.46 0.00 0.00
08:03:03 unix restarts
08:20:00 6.52 11.39 1.83 0.00
08:40:00 0.94 1.99 0.14 0.00
09:00:01 0.78 2.00 0.01 0.00
09:20:00 3.99 3.43 0.36 0.00
09:40:00 1.55 1.65 0.32 0.00
10:00:00 1.54 1.41 0.01 0.00
10:20:00 3.64 3.40 0.06 0.00
10:40:01 2.83 1.90 0.73 0.00
11:00:00 0.48 0.72 0.01 0.00
11:20:00 0.23 0.70 0.00 0.00
Average 0.75 1.03 0.10 0.00
00:00:01 freemem freeswp
01:00:00 25464 512000
02:00:00 25473 512000
03:00:01 25473 512000
04:00:01 25468 512000
05:00:00 25468 512000
06:00:00 25467 512000
07:00:00 25467 512000
08:03:03 unix restarts
08:20:00 25245 512000
08:40:00 24896 512000
09:00:01 24858 512000
09:20:00 24807 512000
09:40:00 24651 512000
10:00:00 24517 512000
10:20:00 24323 512000
10:40:01 23832 512000
11:00:00 23429 512000
11:20:00 23402 512000
Average 25123 512000
00:00:01 cpybuf/s slpcpybuf/s
01:00:00 0.00 0.00
02:00:00 0.00 0.00
03:00:01 0.00 0.00
04:00:01 0.00 0.00
05:00:00 0.00 0.00
06:00:00 0.00 0.00
07:00:00 0.00 0.00
08:03:03 unix restarts
08:20:00 0.00 0.00
08:40:00 0.00 0.00
09:00:01 0.00 0.00
09:20:00 0.00 0.00
09:40:00 0.00 0.00
10:00:00 0.00 0.00
10:20:00 0.00 0.00
10:40:01 0.00 0.00
11:00:00 0.00 0.00
11:20:00 0.00 0.00
Average 0.00 0.00
00:00:01 dptch/s idler/s swidle/s
01:00:00 110.35 101.02 4.77
02:00:00 110.24 100.97 4.72
03:00:01 110.26 100.99 4.73
04:00:01 110.30 101.00 4.74
05:00:00 110.40 101.06 4.73
06:00:00 110.27 100.99 4.74
07:00:00 110.34 101.00 4.73
08:03:03 unix restarts
08:20:00 129.05 104.44 9.25
08:40:00 139.82 112.32 16.86
09:00:01 126.63 105.10 8.00
09:20:00 118.74 101.75 7.46
09:40:00 144.58 108.38 16.45
10:00:00 118.06 102.43 6.75
10:20:00 129.01 102.88 8.31
10:40:01 127.32 104.02 9.16
11:00:00 114.85 100.74 6.63
11:20:00 116.19 101.64 6.91
Average 115.44 102.08 6.28
00:00:01 ovsiohw/s ovsiodma/s ovclist/s
01:00:00 0.00 0.00 0.00
02:00:00 0.00 0.00 0.00
03:00:01 0.00 0.00 0.00
04:00:01 0.00 0.00 0.00
05:00:00 0.00 0.00 0.00
06:00:00 0.00 0.00 0.00
07:00:00 0.00 0.00 0.00
08:03:03 unix restarts
08:20:00 0.00 0.00 0.00
08:40:00 0.00 0.00 0.00
09:00:01 0.00 0.00 0.00
09:20:00 0.00 0.00 0.00
09:40:00 0.00 0.00 0.00
10:00:00 0.00 0.00 0.00
10:20:00 0.00 0.00 0.00
10:40:01 0.00 0.00 0.00
11:00:00 0.00 0.00 0.00
11:20:00 0.00 0.00 0.00
Average 0.00 0.00 0.00
00:00:01 mpbuf/s ompb/s mphbuf/s omphbuf/s pbuf/s spbuf/s dmabuf/s sdmabuf/s
01:00:00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00
02:00:00 0.00 0.00 0.08 0.00 0.00 0.00 0.00 0.00
03:00:01 0.00 0.00 0.08 0.00 0.00 0.00 0.00 0.00
04:00:01 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00
05:00:00 0.00 0.00 0.08 0.00 0.00 0.00 0.00 0.00
06:00:00 0.00 0.00 0.09 0.00 0.00 0.00 0.00 0.00
07:00:00 0.00 0.00 0.12 0.00 0.00 0.00 0.00 0.00
08:03:03 unix restarts
08:20:00 0.00 0.00 3.32 0.00 0.00 0.00 0.00 0.00
08:40:00 0.00 0.00 1.11 0.00 0.00 0.00 0.00 0.00
09:00:01 0.00 0.00 0.38 0.00 0.00 0.00 0.00 0.00
09:20:00 0.00 0.00 1.20 0.00 0.00 0.00 0.00 0.00
09:40:00 0.00 0.00 4.77 0.00 0.00 0.00 0.00 0.00
10:00:00 0.00 0.00 0.31 0.00 0.00 0.00 0.00 0.00
10:20:00 0.00 0.00 0.86 0.00 0.00 0.00 0.00 0.00
10:40:01 0.00 0.00 1.27 0.00 0.00 0.00 0.00 0.00
11:00:00 0.00 0.00 0.18 0.00 0.00 0.00 0.00 0.00
11:20:00 0.00 0.00 0.15 0.00 0.00 0.00 0.00 0.00
Average 0.00 0.00 0.49 0.00 0.00 0.00 0.00 0.00
#
"A mind is a terrible thing to taste."
Microsoft owns some piece of SCO. Not as large a piece as some make it out to be. They have not shaped the decisions of SCO in the past and will not in the future. There is no chance of a MS-Linux product that is tied in with SCO. The only tie Microsoft has with SCO was there royalty licensing contract for XENIX code in SCO OSs. That contract no longer exists and therefore no more ties to Microsoft.
---- "It is never too late to give up our prejudices." --Henry David Thoreau(1817-1862)
This is good news. sar is a useful utility, and the folks at Starnix are good folks.
But SCO is rewriting history in their press releases. "SAR was developed by SCO
sar was a standard utility in Unix SVR4.2 and was included in UnixWare and other SVR4.2 releases before SCO bought UnixWare from Novell, and before Novell bought UnixWare from USL. It may have even existed in SVR3.X
Could this be a sign of the times to come? Major unix vendors open source'ing important apps and porting to other platforms? Sounds good to me, count me in!
--- Stampede linux for me! I play with fire to break the ice..
Nice to see a vendor using one of the existing free software licenses. The Mozilla license is quite good, very similar to the LGPL.
So much for free software....
Personally, I like free software over paranoid idiot slashdot weenies. Part of free software is that anyone can go ahead and modify the code, or sell distributions of the code. If MS were ever to do this, more power to them. I like to be free more than I like to hate Microsoft.
I severely doubt Linus would in any way block anyone who wanted to support linux.
Oh, God forbid.
According to their agreement, IBM has first buying rights. If anyone makes a move, IBM will buy out SCO first. This won't matter much anyway - with all the AIX-UnixWare-ptx integration stuff that's going on, SCO can just lie back and live off the royalties.
This is good news; one of the things I miss most on Linux/*BSD is SAR (and SysV ps). :)
Two notes:
1) Regarding Doug Michels' "FUD"Ding: check out
http://www.sco.com/linux/letter.html. Not the big bad wolf you thought he is; why wasn't _this_ put up here? (yes Rob, you _do_ have a sensationalist streak
2) AFAIK Microsoft owns less than 10% of SCO, and can't make a move to grab the rest: SCO's contract with IBM says IBM've got dibs. It's also an employee-owned company (although I really don't know exactly how that's supposed to stop takeover - not an economistic bone in my body).
Yes, Linux binary compatibility is there through lxrun. My point was that there will not be a Linux distro from the combined efforts of SCO and MS.
---- "It is never too late to give up our prejudices." --Henry David Thoreau(1817-1862)
SARGE and other Sys Admin goodies are freely available at http://www.vais.net/~efinch
Best regards,
Ed Finch
I think the big deal here is that we will now have an open standard for (unix, at least) system performance reporting.
/proc". Well, that works just fine on systems with a /proc filesystem, but it ain't gonna work on the HP-UX systems I admin. Sure, they already have a "sar", but, what if I want to use the same performance monitoring scripts on the SunOS, Solaris, AIX, and Linux boxes as well?
You say "just pull it out of
Will the scripts work "out of the box"?
Do the cmdline switches to sar perform the same?
Is the output going to be the same?
To be honest I don't actually know the answer to these questions using the existing implementations of sar. But I would guess not.
However, with a freely available, open version of sar, I know that the answer to both will be "yes".
Ahh - My eye!
The doctor said I'm not supposed to get Slashdot in it!
I'm sure you meant well, but please, if you have this much information just post a link to it. Otherwise it takes up too much space in the message forums.
If that was what he meant, then he was simply stating the obvious. His point was what? Redhat can't call it's product RedHat Solaris. What is the point. Microsoft has made a UNIX before, it was called Microsoft Xenix. What makes you think if they made a UNIX again and didn't base it off of linux (aka make the MS-distrib) they'd have any desire to call it Linux, or would even think about that possibility.
His point was that if microsoft was to re-enter the *nix market that they would create as much confusion as possible to the point where no one would want to deal with all the mess.
He jokeingly said that microsoft would base their new *nix on BSD, enable it to run Linux binaries, hence enabling them to keep all their precious source code, and call it Linux to add confusion.
I pointed out that this wouldn't be possible because there is trademark control over the word linux.
No one said that they had proof that microsoft was going to do this, and no one said that they would have any desire...
I was simply stating the obvious flaw in his far fetched theorotical nonsense.
Finally someone that makes sense with the lack of a relationship between SCO and Microsoft. Thanks for the good explanation.
---- "It is never too late to give up our prejudices." --Henry David Thoreau(1817-1862)
No one creates hype like MS. They don't need linux's hype. Furthermore, one of the strengths of MS as a business is that they can leverage their control of the OS to force there way into other markets (how do you think they jumpstarted office and IE in the days in which both sucked). Buying into linux would counteract this. Back in the Xenix days, MS put together a pretty stable unix which they controled. They abandoned it, and it never caught on, but that's what they'd probably aim for.
I don't think MS has much interest in linux frankly, except as an obstacle in its domination of a market it wants, but can't get into since their technology doesn't work well there. Sorry kids, MS isn't going to drop Windows and back linux any time in the near future, no matter how much you want to be paranoid about it.
The previous posts have done a good job of reporting what sar is for. It's a system activity logger that reports a very wide range of different system activity measurements over a period of time. It's very useful when you're trying to pin down why your system is being slow, or what resource your running out of and need to buy more of.
From what I've seen in my week or two of playing with Linux is that Linux has the best realtime system performance monitoring I've ever seen in a UNIX, but very little long-term reporting like what sar does. For this reason, sar could be very useful.
Of course, writing a little shell script in Linux that cats certain /proc files into a log periodically may be able to duplicate much of the functionality of sar.
Need a Python, C++, Unix, Linux develop