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Reducing the nice value can be performed by any user. To reduce the nice value of a new top process, the following command would be used:
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Now, if you execute an application that requires a lot of CPU power, you will be able to monitor the impact on the system as a whole by examining the changes in the processes displayed by top. If you execute the command
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the impact on the process distribution is immediately apparent:
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last PID: 16631; load averages: 0.10, 0.07, 0.06 09:34:08 73 processes: 71 sleeping, 1 running, 1 on cpu CPU states: 2.2% idle, 0.6% user, 11.6% kernel, 85.6% iowait, 0.0% swap Memory: 128M real, 1896K free, 72M swap in use, 172M swap free
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This summary tells you that the system now has 73 processes, with only 1 running actively, 1 on the CPU, and 71 sleeping. The new process is the find command, which is actively running. The system is now only 2.2 percent idle, a large increase on the previous sampling epoch. There is still no swapping activity, but iowait activity has risen to 85.6 percent, slowing system performance. The load average for the previous 1, 5, and 15 minutes was 0.10, 0.07, and 0.06 respectively on the average, this machine is still not taxed by its workload and wouldn t be unless the load averages grew to greater than 1. The last PID to be issued to an application, 16631, is also displayed, and in this case it again refers to the find command.
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PID 16631 259 16630 9196 8456 345 16580 13838 13818 112 337 338 157 2295 422 USERNAME pwatters root pwatters pwatters pwatters pwatters pwatters pwatters pwatters root pwatters pwatters root pwatters pwatters THR PRI NICE SIZE RES STATE 1 54 0 788K 668K run 1 59 0 18M 4288K sleep 1 59 0 1956K 1536K cpu 1 48 0 17M 3584K sleep 1 59 0 5984K 0K sleep 8 59 0 7708K 0K sleep 1 59 0 5992K 2748K sleep 1 38 0 2056K 652K sleep 1 59 0 5992K 1884K sleep 3 59 0 1808K 732K sleep 4 59 0 4004K 0K sleep 1 48 0 7508K 0K sleep 5 58 0 2576K 604K sleep 1 48 0 7168K 0K sleep 1 48 0 4096K 0K sleep TIME CPU COMMAND 0:00 1.10% find 58:49 0.74% Xsun 0:00 0.50% top 0:28 0.13% netscape 0:00 0.12% dtpad 0:21 0.11% dtwm 0:00 0.11% dtterm 0:00 0.06% bash 0:01 0.06% dtterm 0:03 0.02% nis_cachemgr 0:00 0.01% ttsession 0:04 0.00% dtsession 0:02 0.00% automountd 0:01 0.00% dtfile 0:01 0.00% textedit
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Part II:
System Essentials
find now uses 1.1 percent of CPU power, which is the highest of any active process (i.e., in the run state) on the system. It uses 788KB of RAM, less than most other processes; however, most other processes are in the sleep state and do not occupy much resident memory.
Using the truss Program
If you ve identified a process that appears to be having problems and you suspect an application bug is the cause, the solution involves more than just going back to the source to debug the program or making an educated guess about what s going wrong. In fact, one of the great features of Solaris is the ability to trace system calls for every process running on the system. This means that if a program is hanging, for example, because it can t find its initialization file, the failed system call revealed using truss would display this information. truss prints out each system call, line by line, as it is executed by the system. The syntax is rather like a C program, making it easy for C programmers to interpret the output. The arguments are displayed by retrieving information from the appropriate headers, and any file information is also displayed. As an example, let s look at the output from the cat command, which we can use to display the contents of /etc/resolv.conf, which is used by the Domain Name Service (DNS) to identify domains and name servers. Let s look at the operations involved in this running this application:
# truss cat /etc/resolv.conf execve("/usr/bin/cat", 0xEFFFF740, 0xEFFFF74C) argc = 2 open("/dev/zero", O_RDONLY) = 3 mmap(0x00000000, 8192, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0xEF7B0000 open("/usr/lib/libc.so.1", O_RDONLY) = 4 fstat(4, 0xEFFFF2DC) = 0 mmap(0x00000000, 8192, PROT_READ|PROT_EXEC, MAP_PRIVATE, 4, 0) = 0xEF7A0000 mmap(0x00000000, 704512, PROT_READ|PROT_EXEC, MAP_PRIVATE, 4, 0) = 0xEF680000 munmap(0xEF714000, 57344) = 0 mmap(0xEF722000, 28368, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE| MAP_FIXED, 4, 598016) = 0xEF722000 mmap(0xEF72A000, 2528, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_PRIVATE| MAP_FIXED, 3, 0) = 0xEF72A000 close(4) = 0 open("/usr/lib/libdl.so.1", O_RDONLY) = 4 fstat(4, 0xEFFFF2DC) = 0 mmap(0xEF7A0000, 8192, PROT_READ|PROT_EXEC, MAP_PRIVATE| MAP_FIXED, 4, 0) = 0xEF7A0000 close(4) = 0 open("/usr/platform/SUNW,Ultra-2/lib/libc_psr.so.1", O_RDONLY) = 4 fstat(4, 0xEFFFF0BC) = 0 mmap(0x00000000, 8192, PROT_READ|PROT_EXEC, MAP_PRIVATE, 4, 0) = 0xEF790000
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