[tor-relays] CPU utilization for relay

[swsnyder at snydernet.net]

FYI, this is a profile of my Tor v0.2.2.30-rc relay, taken in a 10-minute sampling:

CPU: CPU with timer interrupt, speed 0 MHz (estimated)
Profiling through timer interrupt
samples  %        linenr info                 symbol name
3126     29.7290  cast-586.s:9                CAST_encrypt
1677     15.9486  sha256-586.s:8              sha256_block_data_order
1149     10.9272  aes-586.s:424               _x86_AES_encrypt
844       8.0266  sha1-586.s:8                sha1_block_data_order
273       2.5963  crypto.c:1649               crypto_digest_get_digest
221       2.1018  md32_common.h:283           SHA1_Update
182       1.7309  encode.c:190                EVP_EncodeBlock
171       1.6262  OpenBSD_malloc_Linux.c:1793 ifree
136       1.2934  cast-586.s:379              CAST_decrypt
130       1.2363  md32_common.h:348           SHA1_Final
127       1.2078  obj_lib.c:66                OBJ_dup
122       1.1602  memarea.c:221               memarea_alloc
110       1.0461  aes-586.s:1610              _x86_AES_decrypt

After running for 14 hours, the Tor relay has consumed 1.6% of CPU time.  It is now using 45MB of RAM, servicing 112 active connections.

According to http://torstatus.blutmagie.de my Max/Burst/Observed (Bps) bandwidth is:

    153600 / 307200 / 127170

Environment:

CPU: Pentium-M (Dothan) @ 1.80 GHz
RAM: 1.0 GB DDR1
Net: Fast Ethernet connected to a Surfboard cable modem

CentOS v5.6
Tor v0.2.2.30-rc
libevent 2.0.12-stable
openssl 1.0.0d
zlib 1.2.5
glibc 2.5-58

Just another data point.