当我运行top -n 1 -d 2 | head -n 12;时，它返回按%cpu desc排序的一些进程的处理器使用情况，但我不相信结果是聚合的。我想把这些结果放到文件中，比如
while true; do
top -n 1 -d 2 | head -n 12;
done > top_cpu_users;
当我以交互方式运行top -d 2;时，我首先看到一些结果，然后两秒钟后我看到更新的结果，它们似乎是在过去两秒钟内聚合的。第一个结果似乎没有以相同的方式汇总。
如何获得每两秒的top cpu用户在前两秒的总和?
top将始终捕获进程信息的第一次完整扫描，以用作基线。它使用它来初始化实用程序的值数据库，这些值用于以后的比较报告。这是呈现在屏幕上的第一份报告的基础。
后续报告是对指定评估间隔的真实度量。
因此，你的代码片段永远不会提供你真正想要的东西。
您需要跳过第一次扫描的结果，只使用后续的报告，但是这样做的唯一方法是通过指定所需的扫描计数从单个命令生成它们，然后解析结果组合报告。
为此，这里有一个建议的解决方案:
#!/bin/bash
output="top_cpu_users"
rm -f ${output} ${output}.tmp
snapshots=5
interval=2
process_count=6 ### Number of heavy hitter processes being monitored
top_head=7 ### Number of header lines in top report
lines=$(( ${process_count} + ${top_head} )) ### total lines saved from each report run
echo -e "n Collecting process snapshots every ${interval} seconds ..."
top -b -n $(( ${snapshots} + 1 )) -d ${interval} > ${output}.tmp
echo -e "n Parsing snapshots ..."
awk -v max="${lines}" 'BEGIN{
doprint=0 ;
first=1 ;
}
{
if( $1 == "top" ){
if( first == 1 ){
first=0 ;
}else{
print NR | "cat >&2" ;
print "" ;
doprint=1 ;
entry=0 ;
} ;
} ;
if( doprint == 1 ){
entry++ ;
print $0 ;
if( entry == max ){
doprint=0 ;
} ;
} ;
}' ${output}.tmp >${output}
more ${output}
会话输出如下所示:
Collecting process snapshots every 2 seconds ...
Parsing snapshots ...
266
531
796
1061
1326
top - 20:14:02 up 8:37, 1 user, load average: 0.15, 0.13, 0.15
Tasks: 257 total, 1 running, 256 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.5 us, 1.0 sy, 0.0 ni, 98.5 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
MiB Mem : 3678.9 total, 157.6 free, 2753.7 used, 767.6 buff/cache
MiB Swap: 2048.0 total, 1116.4 free, 931.6 used. 629.2 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
31773 root 20 0 0 0 0 I 1.5 0.0 0:09.08 kworker/0:3-events
32254 ericthe+ 20 0 14500 3876 3092 R 1.0 0.1 0:00.04 top
1503 mysql 20 0 2387360 20664 2988 S 0.5 0.5 3:10.11 mysqld
2250 ericthe+ 20 0 1949412 130004 20272 S 0.5 3.5 0:46.16 caja
3104 ericthe+ 20 0 4837044 461944 127416 S 0.5 12.3 81:26.50 firefox
29998 ericthe+ 20 0 2636764 165632 54700 S 0.5 4.4 0:36.97 Isolated Web Co
top - 20:14:04 up 8:37, 1 user, load average: 0.14, 0.13, 0.15
Tasks: 257 total, 1 running, 256 sleeping, 0 stopped, 0 zombie
%Cpu(s): 1.5 us, 0.7 sy, 0.0 ni, 97.4 id, 0.4 wa, 0.0 hi, 0.0 si, 0.0 st
MiB Mem : 3678.9 total, 157.5 free, 2753.7 used, 767.6 buff/cache
MiB Swap: 2048.0 total, 1116.4 free, 931.6 used. 629.2 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3104 ericthe+ 20 0 4837044 462208 127416 S 3.0 12.3 81:26.56 firefox
1503 mysql 20 0 2387360 20664 2988 S 1.0 0.5 3:10.13 mysqld
32254 ericthe+ 20 0 14500 3876 3092 R 1.0 0.1 0:00.06 top
1489 root 20 0 546692 61584 48956 S 0.5 1.6 17:23.78 Xorg
2233 ericthe+ 20 0 303744 11036 7500 S 0.5 0.3 4:46.84 compton
7239 ericthe+ 20 0 2617520 127452 44768 S 0.5 3.4 1:41.13 Isolated Web Co
top - 20:14:06 up 8:37, 1 user, load average: 0.14, 0.13, 0.15
Tasks: 257 total, 1 running, 256 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.6 us, 0.4 sy, 0.0 ni, 99.0 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
MiB Mem : 3678.9 total, 157.5 free, 2753.7 used, 767.6 buff/cache
MiB Swap: 2048.0 total, 1116.4 free, 931.6 used. 629.2 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1489 root 20 0 546700 61584 48956 S 1.5 1.6 17:23.81 Xorg
3104 ericthe+ 20 0 4837044 462208 127416 S 1.5 12.3 81:26.59 firefox
1503 mysql 20 0 2387360 20664 2988 S 0.5 0.5 3:10.14 mysqld
2233 ericthe+ 20 0 303744 11036 7500 S 0.5 0.3 4:46.85 compton
2478 ericthe+ 20 0 346156 10368 8792 S 0.5 0.3 0:22.97 mate-cpufreq-ap
2481 ericthe+ 20 0 346540 11148 9168 S 0.5 0.3 0:41.73 mate-sensors-ap
top - 20:14:08 up 8:37, 1 user, load average: 0.14, 0.13, 0.15
Tasks: 257 total, 1 running, 256 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.6 us, 0.5 sy, 0.0 ni, 98.9 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
MiB Mem : 3678.9 total, 157.5 free, 2753.6 used, 767.7 buff/cache
MiB Swap: 2048.0 total, 1116.4 free, 931.6 used. 629.3 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
32254 ericthe+ 20 0 14500 3876 3092 R 1.0 0.1 0:00.08 top
3104 ericthe+ 20 0 4837044 462208 127416 S 0.5 12.3 81:26.60 firefox
18370 ericthe+ 20 0 2682392 97268 45144 S 0.5 2.6 0:55.36 Isolated Web Co
19436 ericthe+ 20 0 2618496 123608 52540 S 0.5 3.3 1:55.08 Isolated Web Co
26630 ericthe+ 20 0 2690464 179020 56060 S 0.5 4.8 1:45.57 Isolated Web Co
29998 ericthe+ 20 0 2636764 165632 54700 S 0.5 4.4 0:36.98 Isolated Web Co
top - 20:14:10 up 8:37, 1 user, load average: 0.13, 0.13, 0.15
Tasks: 257 total, 1 running, 256 sleeping, 0 stopped, 0 zombie
%Cpu(s): 2.5 us, 0.9 sy, 0.0 ni, 96.6 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
MiB Mem : 3678.9 total, 157.5 free, 2753.6 used, 767.7 buff/cache
MiB Swap: 2048.0 total, 1116.4 free, 931.6 used. 629.3 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
3104 ericthe+ 20 0 4837076 463000 127416 S 7.5 12.3 81:26.75 firefox
1489 root 20 0 546716 61584 48956 S 1.5 1.6 17:23.84 Xorg
1503 mysql 20 0 2387360 20664 2988 S 1.0 0.5 3:10.16 mysqld
32254 ericthe+ 20 0 14500 3876 3092 R 1.0 0.1 0:00.10 top
2233 ericthe+ 20 0 303744 11036 7500 S 0.5 0.3 4:46.86 compton
2481 ericthe+ 20 0 346540 11148 9168 S 0.5 0.3 0:41.74 mate-sensors-ap