1、運行/usr/contrib/bin/crashinfo（根據第二步實際情況） | more，信息中注意類似如下內容：
==================
= Memory Globals =
==================

Note: "freemem" was resynced with freemem caches: was 169536, now 168628

Physical Memory = 2096640 pages (8.00 GB) //物理內存總量
Free Memory = 168628 pages (658.70 MB)//空閑內存
Average Free Memory = 169403 pages (661.73 MB)//平均空閑內存
gpgslim = 7168 pages (28.00 MB)
lotsfree = 32768 pages (128.00 MB)
desfree = 7168 pages (28.00 MB)
minfree = 3328 pages (13.00 MB)
**************物理內存使用率=（物理內存總量-空閑內存）/物理內存總量***************
========================
= Buffer Cache Globals =
========================

dbc_max_pct = 50 %
dbc_min_pct = 5 %
dbc current pct = 50.0 %
bufpages = 1048320 pages (4.00 GB)
Number of buf headers = 557940

fixed_size_cache = 0
dbc_parolemem = 0
dbc_stealavg = 0
dbc_ceiling = 1048320 pages (4.00 GB)
dbc_nbuf = 52416
dbc_bufpages = 104832 pages (409.50 MB)
dbc_vhandcredit = 11403
orignbuf = 0
origbufpages = 0 pages

====================
= Swap Information =
====================

swapinfo -mt emulation
======================

Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 16384 0 16098 0% 0 - 1 LVM vg00/lv2
reserve - 2141 -2141
memory 6460 4928 1532 76%
total 22844 7069 15489 31% - 0 -
*****************SWAP內存使用率就是total的PCT值：31%*************************
2、CPU的使用率可以從top參數得出：
System: JXCNMD1 Fri Aug 17 10:25:02 2007
Load averages: 0.35, 0.41, 0.44
311 processes: 257 sleeping, 53 running, 1 zombie
Cpu states:
CPU LOAD USER NICE SYS IDLE BLOCK SWAIT INTR SSYS
0 0.74 8.8% 3.8% 2.0% 85.5% 0.0% 0.0% 0.0% 0.0%
1 0.17 4.4% 6.2% 10.2% 79.3% 0.0% 0.0% 0.0% 0.0%
2 0.12 3.8% 1.0% 1.0% 94.2% 0.0% 0.0% 0.0% 0.0%
3 0.36 0.0% 70.9% 28.1% 1.0% 0.0% 0.0% 0.0% 0.0%
--- ---- ----- ----- ----- ----- ----- ----- ----- -----
avg 0.35 4.2% 20.6% 10.2% 65.1% 0.0% 0.0% 0.0% 0.0%
*****************系統一共4個CPU，每個CPU的使用率=100%-IDLE值*******************
3、top命令的一些解釋
問：
top中的幾個參數的意義能幫忙解釋一下嗎？
主要是對 free的計算方法不太理解，機器的物理內存有256M，free中的33M是怎么計算出來
的呢？

Memory: 92764K (15880K) real, 65796K (13316K) virtual, 33684K free Page# 1/5

另外，SAM中有如下有關信息

xx x Processor xx Memory xx Operating System xx Network xx Dynamic x x
xx lqqqqqqqqqqqq/ qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqk x
xx xlqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqkx x
xx xxPhysical Memory: 256.2 MB xx x
xx xxReal Memory: xx x
xx xx Active: 21113.5 KB xx x
xx xx Total: 97083.5 KB xx x
xx xxVirtual Memory: xx x
xx xx Active: 16247.3 KB xx x
xx xx Total: 68390.7 KB xx x
xx xxFree Memory Pages: 6738 at 4 KB/page xx x
xx xxSwap Space: xx x
xx xx Avail: 1024 MB xx x
xx xx Used: 231 MB xxvx
xmqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqjx

其中的Virtual Memory和 Swap Space是什么關系呢？我想計算虛擬內存的利用率該如何計算呢？


答：
top 只能看到進程所使用的內存量，所以你看到的 92764K (15880K) real 就是所有進程所使用的內存總和，這個內存是指物理內存，括號前那個值是Total Real Memory,括號內是Active Real Memory, 這兩者的區別就在于Active Real Memory的值只是分配給那些已經在run queue或者正在運行的進程的Real Memory,而Total Real Memory 包括所有的進程。
對于后一項值 65796K (13316K) virtual 的解釋也是同樣的，不過這個值代表了Virtual Memory（一般為建在Disk上的Swap空間，當然你要問了，我的Swap空間可不止這么些啊 by executing ‘swapinfo‘， 沒錯，Swap空間是大于這里的Total Vitual Memory的，但我前面說了，這里的值只是計算的分配給進程的），最后一項33684K free 到確確實實是Free 的Memory，它等于Physical Mem - kernel used - user used - buffer cache。


下面是對SAM->;Performance Monitor ->; System Property ->; Memory的顯示結果的解釋

Physical Memory 256.2 MB 實際物理內存大小
Real Memory
Active: 21113.5 KB 同 top （當然這里舉的例子由于有時間差，所以看上去不大一致）
Total: 97083.5 KB 同 top
Virtual Memory:
Active: 16247.3 KB 同 top
Total: 68390.7 KB 同 top
Free Memory Pages: 6738 at 4 KB/page 6738 * 4 就是 top 顯示出來的結果
Swap Space:
Avail: 1024 MB 同Swapinfo中 dev filesystem 總和（一般不會用到Pseudo Memory)，為實際Swap Space 的大小。
Used: 231 MB 同Swapinfo中的Reserve, 為系統在創建進程時為該進程預留的Swap 空間總和）