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Do not store cached_dir_t for consensus in RAM if not a dircache.

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There are three reasons we use a cached_dir_t to hold a consensus:
  1. to serve that consensus to a client
  2. to apply a consensus diff to an existing consensus
  3. to send the consensus to a controller.

But case 1 is dircache-only.  Case 2 and case 3 both fall back to
networkstatus_read_cached_consensus().  So there's no reason for us
to store this as a client.  Avoiding this saves about 23% of our RAM
usage, according to our experiments last month.

This is, semantically, a partial revert of e5c608e535.

Fixes bug 27247; bugfix on 0.3.0.1-alpha.
This commit is contained in:
Nick Mathewson 2018-09-07 19:45:01 -04:00
parent 95060eacae
commit 33a0c619a8
2 changed files with 11 additions and 5 deletions
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5
changes/ticket27247 Normal file
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@ -0,0 +1,5 @@
o Minor bugfixes (client, memory usage):
- When not running as a directory cache, there is no need to store the
text of the current consensus networkstatus in RAM. Previously,
however, clients would store this anyway, at a cost of over 5 MB.
Now, they do not. Fixes bug 27247; bugfix on 0.3.0.1-alpha.

3
src/feature/nodelist/networkstatus.c
View File

@ -2098,12 +2098,13 @@ networkstatus_set_current_consensus(const char *consensus,
}
if (we_want_to_fetch_flavor(options, flav)) {
if (dir_server_mode(get_options())) {
dirserv_set_cached_consensus_networkstatus(consensus,
flavor,
&c->digests,
c->digest_sha3_as_signed,
c->valid_after);
if (dir_server_mode(get_options())) {
consdiffmgr_add_consensus(consensus, c);
}
}