ppppmmmmvvvvccccrrrr is the VCR mode server that implements the playback services of the
Performance Metrics Collector Daemon, ppppmmmmccccdddd(1), within the Performance
Co-Pilot (PCP) framework.
On a system where there is an instance of ppppmmmmccccdddd(1) running, there may be
an associated instance of ppppmmmmvvvvccccrrrr that is launched by ppppmmmmccccdddd(1), if, and only
if, it is required. This is the only way that ppppmmmmvvvvccccrrrr should be launched,
and under no circumstances will it be helpful to launch ppppmmmmvvvvccccrrrr either
interactively, or from a script.
When clients of the associated ppppmmmmccccdddd(1), make requests to retrieve the
values of performance metrics from the recent past, these requests are
intercepted below the Performance Metrics Application Programming
Interface (PMAPI) in the client, and are forwarded directly to ppppmmmmvvvvccccrrrr.
For each client, the first such request involves establishing a TCP/IP
socket with ppppmmmmvvvvccccrrrr, and ppppmmmmvvvvccccrrrr accepts these incoming connection requests
on the file descriptor _r_e_q_f_d specified with the ----rrrr option. ppppmmmmvvvvccccrrrr
responds directly to the requesting client.
The _p_m_c_d-_o_p_t_i_o_n_s are all of the options specified when ppppmmmmccccdddd(1) was
started, and these are passed directly to ppppmmmmvvvvccccrrrr.
All information returned by ppppmmmmvvvvccccrrrr is actually obtained from the archives
maintained by the system instance of the PCP logger program, ppppmmmmllllooooggggggggeeeerrrr(1).
FFFFIIIILLLLEEEESSSS
....////ppppmmmmvvvvccccrrrr....lllloooogggg (or $$$${{{{PPPPCCCCPPPP____LLLLOOOOGGGGDDDDIIIIRRRR----////vvvvaaaarrrr////aaaaddddmmmm////ppppccccpppplllloooogggg}}}}////ppppmmmmvvvvccccrrrr....lllloooogggg when
ppppmmmmccccdddd(1) has been started automatically from