centos上怎样记录一段时间内进程的流量情况？

打酱油的

atop可以试试看。

下面是systemd的配置范例，自行指定日志的轮转间隔，注意频率太高会对CPU造成压力
[root@ centos-ops ~]
17:48:35 # cat /usr/lib/systemd/system/atop.service
[Unit]
Description=Atop advanced performance monitor
Documentation=man:atop(1)

[Service]
Type=simple
Environment="LOGOPTS="
Environment="LOGINTERVAL=600"
Environment="LOGGENERATIONS=7"
Environment="LOGPATH=/var/log/atop"
EnvironmentFile=/etc/sysconfig/atop
ExecStartPre=/bin/sh -c 'test -n "$LOGINTERVAL" -a "$LOGINTERVAL" -eq "$LOGINTERVAL"'
ExecStartPre=/bin/sh -c 'test -n "$LOGGENERATIONS" -a "$LOGGENERATIONS" -eq "$LOGGENERATIONS"'
ExecStart=/bin/sh -c 'exec /usr/bin/atop ${LOGOPTS} -w "${LOGPATH}/atop_$(date +%%Y%%m%%d)" ${LOGINTERVAL}'
ExecStartPost=/usr/bin/find "${LOGPATH}" -name "atop_*" -mtime +${LOGGENERATIONS} -exec rm -v {} \;
KillSignal=SIGUSR2

[Install]
WantedBy=multi-user.target