分类： 系统运维
2012-01-14 10:28:08
| 系统中有很多命令可以查看cpu的个数，但是哪个命令输出的是逻辑cpu个数，哪个又是物理cpu个数呢？我们下面做一个简单的介绍。 解答: 从AIX5.3起，对于power5的机器，系统引入了SMT（Simultaneousmulti-threading）的功能，其允许两个处理线程在同一颗处理器上运行，对操作系统而言，一颗物理处理器逻辑上会成为两个处理单元（逻辑处理器）。也就是说，在SMT功能启用的情况下，逻辑cpu个数是物理cpu个数的两倍，而在SMT功能禁用的情况下，逻辑cpu个数与物理cpu个数相等。 下面我们介绍如何通过各种命令检查系统中的物理cpu和逻辑cpu的个数。 1. smtctl # smtctl This system is SMT capable. SMT is currently enabled. SMT boot mode is not set. SMT threads are bound to the same physical processor. proc0 has 2 SMT threads. Bind processor 0 is bound with proc0 Bind processor 1 is bound with proc0 proc2 has 2 SMT threads. Bind processor 2 is bound with proc2 Bind processor 3 is bound with proc2 proc4 has 2 SMT threads. Bind processor 4 is bound with proc4 Bind processor 5 is bound with proc4 proc6 has 2 SMT threads. Bind processor 6 is bound with proc6 Bind processor 7 is bound with proc6 可以看到，该系统具有SMT能力且当前SMT功能已启用。4个物理cpu对应着8个逻辑cpu。 2. bindprocessor # bindprocessor -q The available processors are: 0 1 2 3 4 5 6 7 可以看到可用逻辑cpu个数是8个（0-7）。 3. prtconf # prtconf System Model: IBM,9131-52A Machine Serial Number: 0677A5G Processor Type: PowerPC_POWER5 Number Of Processors: 4 ==》物理cpu有4个 Processor Clock Speed: 1648 MHz CPU Type: 64-bit Kernel Type: 64-bit LPAR Info: 1 06-77A5G 4.lsdev # lsdev -Cc processor proc0 Available 00-00 Processor proc2 Available 00-02 Processor proc4 Available 00-04 Processor proc6 Available 00-06 Processor 可以看到系统中有4个物理cpu。 5.vmstat # vmstat System configuration: lcpu=8 mem=7936MB kthr memory page faults cpu ----- ----------- ------------------------ ------------ ----------- r b avm fre re pi po fr sr cy in sy cs us sy id wa 1 1 428238 41599 0 0 0 13 25 0 40 1639 182 0 0 99 可以看到系统中有8个逻辑cpu。 |
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