Java 无法重新启动Jenkins-内存错误

重新启动Jenkins时，我遇到以下错误

INFO: Ready to receive data from Gerrit: Gerrit-QA
Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00000007b1480000, 246939648, 0) failed; error='C
annot allocate memory' (errno=12)
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 246939648 bytes for committing reserved memory.
# An error report file with more information is saved as:
# /usr/share/tomcat6/hs_err_pid29653.log

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如何解决此问题？

释放一些内存？该命令是正确的sync | sudo tee/proc/sys/vm/drop_缓存或swapoff-a&&swapon-a？不，它只清除缓存。分配的内存太多，例如运行的程序太多。是否释放一些内存？命令正确：sync | sudo tee/proc/sys/vm/drop_caches或swapoff-a&&swapon-a？不，仅清除缓存。分配的内存太多，例如运行的程序太多。