服务器中有6个NGINX进程。自从NGINX启动以来，RES / VIRT值一直在增长，直到内存不足为止。它是否表明存在内存泄漏？
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1941 root 20 0 621m 17m 4144 S 290.4 0.1 8415:03 mongod
16383 nobody 20 0 1675m 1.6g 724 S 21.0 5.2 13:19.30 nginx
16382 nobody 20 0 1671m 1.6g 724 S 17.2 5.1 13:21.39 nginx
16381 nobody 20 0 1674m 1.6g 724 S 15.3 5.1 13:28.45 nginx
16380 nobody 20 0 1683m 1.6g 724 S 13.4 5.2 13:24.77 nginx
16384 nobody 20 0 1674m 1.6g 724 S 13.4 5.1 13:19.83 nginx
16385 nobody 20 0 1685m 1.6g 724 S 13.4 5.2 13:25.00 nginx