It's not hard to see why synchronization can have a significant effect on program performance; flushing the cache frequently can be expensive.

不难看出为什么同步会对程序的性能影响这么大；频繁地刷新缓存代价会很大。

youdao

The cost difference between an uncontended synchronization and a contended one is huge; a simple test program suggested that a contended synchronization is 50 times slower than an uncontended one.

并且无争用同步和争用同步间的性能损失差别很大；一个简单的测试程序指出争用同步比无争用同步慢 50 倍。

youdao

All updates to recoverable resources or requests to other transactional systems are now part of this unit-of-work, until a synchronization point (syncpoint) is reached within the CICS program.

所有对可恢复资源的更新或对其他事务系统的请求现在都是此工作单元的一部分，直到在CICS程序内部达到一个同步点(syncpoint)。

youdao