poll pollin

First, the phenomenon 1. See if a process exists Ps-ef | Grep-v ' grep ' |grep-e ' Shell/cron/bonus/cash ' www 2624 1 0 Oct24? 00:00:35/usr/local/bin/php/data1/www/htdocs/hb.e.weibo.com/v2/www/htdocs/index.php--uri=shell/cron/bonus/cash-

{Code ...} the above is the php code, and then I strace it, the result is as follows {code ...} after sending the get command in line 3, poll is called. The timeout value is the value of line 0, 1572, and the value of timeout is 2000. Why do I need

$host = '127.0.0.1';$port = 8888;$key = 'group:32149904:binding';$redis = new Redis();$redis->pconnect($host, $port);$obj = $redis->get($key);echo $obj, PHP_EOL; PHP code is the above, and then I strace a bit, the result is as follows 1565 Connect (3

With the full support of the 2.6 kernel to epoll, many articles and sample code on the network provide a message that using Epoll instead of the traditional poll can bring a performance boost to Web service applications. But most of the reasons for

1 select function int select(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout);1.1 parameter description the first parameter NFDs is the maximum descriptor value added to the fdset set by 1. fdset is

SelectThe essence is to use 32-bit 32-bit integer, that is, 32*32 = 1024, And the FD value is 1-1024. When the FD value exceeds the 1024 limit, you must modify the fd_setsize. In this case, you can identify the FD in the 32 * max value range.

1. Basic knowledgeThe poll mechanism is similar to select in that there is no significant difference in nature with Select, that managing multiple descriptors is also polling and processing according to the state of the descriptor, but poll has no

First, review the previous Select Select Advantages: currently supported on almost all platforms, and its good cross-platform support is one of its advantages Select Cons: 1. Each call to

Original URL: http://www.cnblogs.com/alyssaCui/archive/2013/04/01/2993886.htmlPollPoll or select is familiar to most unix/linux programmers, and these two things are similar in principle, there is no significant difference in performance, but Select

1.select ModelsThe 1.1 Select function is prototyped as follows, where Nfds represents the maximum value of the Descriptor plus 1 (because this is the left-right open interval), and the middle three parameters represent a collection of different