通过设置Weblogic设置线程数提高系统并发
使用Weblogic版本：Weblogic 11g(10.3.6)
设置Weblogic的线程数有两种方法，
第一种，通过启动参数设置：
-Dweblogic.threadpool.MinPoolSize=1000 -Dweblogic.threadpool.MaxPoolSize=1000
可以加在setDomainEnv.sh文件JAVA_OPTIONS下面；
第二种，通过config.xml配置文件：
AdminServer
1000
1000
Window环境下设置完应该直接重新启动就可以生效，Linux下，有可能会出现以下错误：
Attempting to allocate 4G bytes
There is insufficient native memory for the Java
Runtime Environment to continue.
Possible reasons:
The system is out of physical RAM or swap space
In 32 bit mode, the process size limit was hit
Possible solutions:
Reduce memory load on the system
Increase physical memory or swap space
Check if swap backing store is full
Use 64 bit Java on a 64 bit OS
Decrease Java heap size (-Xmx/-Xms)
Decrease number of Java threads
Decrease Java thread stack sizes (-Xss)
Disable compressed references (-XXcompressedRefs=false)
java.lang.OutOfMemoryError: Resource temporarily unavailable in tsStartJavaThread (lifecycle.c:1097).
Attempting to allocate 4G bytes
There is insufficient native memory for the Java
Runtime Environment to continue.
Possible reasons:
The system is out of physical RAM or swap space
In 32 bit mode, the process size limit was hit
Possible solutions:
Reduce memory load on the system
Increase physical memory or swap space
Check if swap backing store is full
Use 64 bit Java on a 64 bit OS
Decrease Java heap size (-Xmx/-Xms)
Decrease number of Java threads
Decrease Java thread stack sizes (-Xss)
Disable compressed references (-XXcompressedRefs=false)
出现这个原因的问题可能是因为Linux下系统对用户的默认线程数做了限制，可以通过：
ulimit -a
命令进行查看：
core file size (blocks, -c) 0
data seg size (kbytes, -d) unlimited
scheduling priority (-e) 0
file size (blocks, -f) unlimited
pending signals (-i) 515223
max locked memory (kbytes, -l) 64
max memory size (kbytes, -m) unlimited
open files (-n) 1024
pipe size (512 bytes, -p) 8
POSIX message queues (bytes, -q) 819200
real-time priority (-r) 0
stack size (kbytes, -s) 10240
cpu time (seconds, -t) unlimited
max user processes (-u) 1024
virtual memory (kbytes, -v) unlimited
file locks (-x) unlimited
其中
max user processes (-u) 1024
表示当前系统允许的最大线程数，可以把此参数设大一些。
ulimit -u 5000
设置当前系统用户最大允许的线程数，只对本次会话有效，如果想要永久生效，可以通过修改：
$ 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
只需要将1024改成你需要的值即可，设置完需要重启系统已生效。
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