Quoting MK <pub...@kubikcz.net>: > Hello, > > maybe you still recall about problem with ftpd memory allocation I > posted > here few days before. Since then I tried to do more "research" and found > > same issue on two different HW boxes both with OpenBSD 4.5 and OpenBSD > 4.6. > To summarize it, I found that built-in ftpd server takes too much memory > > while clients are downloading files and this memory is not freed neither > > when downloads are finished nor when I kill ftpd. What's more, top, ps, > > vmstat does not show by which process is memory allocated. All I can see > > during ftp downloads initiated by clients it's just decreasing free > memory > and increasing allocated memory from top command output. After few > minutes > of downloading I lost about 800MB real memory. Allocated memory shown by > top > command is a part of real memory behind the "/". This should be > something > like allocated memory which is not currently used if I'm not mistaken. > > Although I'm not sure if this could be intentional behavior I have three > > main questions: > > 1. Is it normal that memory is not freed after I kill ftpd daemon? > 2. Is it normal ftpd can take about 800MB of real memory while serving > GET > requests? (only 1 client is able to consume that portion of memory) > 3. Is it normal that this memory seems to be lost from the system? It's > not > visible as allocated by some process. > > Thank you for your help. > MK > >
I cannot reproduce here - artificial tests on a box running as a desktop, so take the figures with a pinch of salt; but if there was an issue with the stock ftpd I'd expect to see something? i386 4.6 with errata patches. # /usr/libexec/ftpd -D # ftp localhost Memory: Real: 272M/661M act/tot Free: 1338M Swap: 0K/251M used/tot Get 459Mb file 1/2 way Memory: Real: 273M/667M act/tot Free: 1332M Swap: 0K/251M used/tot Done Memory: Real: 273M/659M act/tot Free: 1340M Swap: 0K/251M used/tot 150 Opening BINARY mode data connection for '32r2741.iso' (481689600 bytes). 100% |*******************************************************************************************| 459 MB 01:08 226 Transfer complete. 200 NOOP command successful. 481689600 bytes received in 68.57 seconds (6.70 MB/s) Get it again ... 1/2 way Memory: Real: 273M/667M act/tot Free: 1332M Swap: 0K/251M used/tot Done Memory: Real: 273M/667M act/tot Free: 1332M Swap: 0K/251M used/tot And again ... 70% Memory: Real: 273M/659M act/tot Free: 1340M Swap: 0K/251M used/tot Done Memory: Real: 273M/663M act/tot Free: 1336M Swap: 0K/251M used/tot And again ... 1/2 way Memory: Real: 273M/667M act/tot Free: 1332M Swap: 0K/251M used/tot Done Memory: Real: 273M/662M act/tot Free: 1337M Swap: 0K/251M used/tot Fifth time, this time with 2 clients getting the same file ... Before Memory: Real: 275M/667M act/tot Free: 1332M Swap: 0K/251M used/tot 1/2 way Memory: Real: 274M/666M act/tot Free: 1333M Swap: 0K/251M used/tot 70% Memory: Real: 274M/667M act/tot Free: 1332M Swap: 0K/251M used/tot Done Memory: Real: 273M/662M act/tot Free: 1337M Swap: 0K/251M used/tot At the half-way mark ... PID USERNAME PRI NICE SIZE RES STATE WAIT TIME CPU COMMAND 23507 xxxxxxxx -5 0 620K 972K sleep biowait 0:09 0.93% ftpd 15892 root 2 0 1244K 848K sleep netio 0:06 0.63% ftp 23158 xxxxxxxx 2 0 1236K 828K sleep netio 0:00 0.49% ftp 23359 xxxxxxxx -14 0 620K 944K sleep inode 0:00 0.44% ftpd Quit both ftp clients ... Memory: Real: 273M/662M act/tot Free: 1337M Swap: 0K/251M used/tot # ps waux | grep ftpd root 6424 0.0 0.0 568 836 ?? Is 3:49PM 0:00.00 /usr/libexec/ftpd -D root 4008 0.0 0.0 444 804 p1 S+ 4:04PM 0:00.00 grep ftpd # kill 6424 # ps waux | grep ftpd root 32390 0.0 0.0 484 4 p1 R+ 4:05PM 0:00.00 grep ftpd (ksh) Memory: Real: 271M/662M act/tot Free: 1337M Swap: 0K/251M used/tot HTH.
