很久沒有更新博客了，說下系統(tǒng)環(huán)境：

uname?-a Linux?REDHAT6?2.6.32-279.el6.x86_64?#1?SMP?Wed?Jun?13?18:24:36?EDT?2012?x86_64?x86_64?x86_64?GNU/Linux

tomcat的java進(jìn)程號1243

[root@REDHAT6?proc]#?ps?-eL|head?-1PID???LWP?TTY??????????TIME?CMD [root@REDHAT6?proc]#?ps?-eL|grep?java1243??1243?pts/0????00:00:00?java1243??1244?pts/0????00:00:01?java1243??1245?pts/0????00:00:32?java1243??1246?pts/0????00:00:00?java1243??1247?pts/0????00:00:00?java1243??1248?pts/0????00:00:00?java1243??1249?pts/0????00:00:03?java1243??1250?pts/0????00:00:04?java1243??1251?pts/0????00:00:00?java1243??1252?pts/0????00:00:08?java1243??1253?pts/0????00:00:00?java1243??1259?pts/0????00:00:00?java

cd /proc

[root@REDHAT6?proc]#?ls?-d?[0-9]*? 1?????1058??11????1158??12????1212??1395??16??2???23???25???27???293??31??35??381??40??44??52???692??729??733??9 10????1068??1111??1166??1207??1243??14????17??20??24???250??28???294??32??36??383??41??49??53???693??730??772 1014??1069??1128??1174??1209??1265??1462??18??21??242??251??29???3????33??37??39???42??5???6????7????731??8 1021??1097??1136??1189??1210??13????15????19??22??243??26???292??30???34??38??4????43??50??687??728??732??83我們會發(fā)現(xiàn)根本看不到1244,1245等pid，別急，[root@REDHAT6?proc]#?ls?1244??? attr???????clear_refs???????cwd??????fdinfo????maps???????mountstats??oom_score??????root???????smaps??status autogroup??cmdline??????????environ??io????????mem????????net?????????oom_score_adj??sched??????stack??syscall auxv???????coredump_filter??exe??????limits????mountinfo??numa_maps???pagemap????????schedstat??stat???task cgroup?????cpuset???????????fd???????loginuid??mounts?????oom_adj?????personality????sessionid??statm??wchan [root@REDHAT6?proc]#?ll?1244/exe lrwxrwxrwx?1?root?root?0?11月??6?11:27?1244/exe?->?/usr/local/jdk1.6.0_45/bin/java

看到了吧，雖然看不到1244，但是顯示的內(nèi)容其實就是1243的內(nèi)容，本質(zhì)上1244就是LWP進(jìn)程號,linux的線程其實是LWP輕量級進(jìn)程模擬出來的。

同時我們也可以理解，linux下最大進(jìn)程數(shù)限制同時也對線程起了作用。如果要增大最大線程數(shù)，那就要增大最大進(jìn)程數(shù)。

[root@REDHAT6?proc]#?cat?/etc/security/limits.d/90-nproc.conf? #?Default?limit?for?number?of?user's?processes?to?prevent #?accidental?fork?bombs. #?See?rhbz?#432903?for?reasoning.*??????????soft????nproc?????1024

轉(zhuǎn)載于:https://blog.51cto.com/linuxgp/1572996

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