lizj3624 opened a new issue #6412:
URL: https://github.com/apache/apisix/issues/6412
### Issue description
lj_str_new high CPU usague when performance testing with about 10k http
request body，I think it's ngx_lua promble, [ngx_lua
issue](https://github.com/openresty/lua-nginx-module/issues/2015)，apisix tested
similar case and encountered similar problems?
lj_str_new high cpu usague when access_by_lua of ngx_lua
### Environment
- OS (cmd: `uname -a`): Centos6
- OpenResty / Nginx version (cmd: `nginx -V` or `openresty -V`):
OpenResty-1.15.8
- CPU: Intel(R) Xeon(R) CPU E5-2620 v4 @ 2.10GHz
- worker num: 15
- http request 8k ~10k，10w qps
### Steps to reproduce
1. performance testing with about 10k http request body
2. access_by_lua enabled
### Actual result
lj_str_new high CPU usague
### Error log
lj_str_new high CPU usague
### Expected result
_No response_
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