commit 33a0c619a8f44cacb400eccc4ab6192d330465c6 Author: Nick Mathewson nickm@torproject.org Date: Fri Sep 7 19:45:01 2018 -0400

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

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 e5c608e535ef9a4c4fe951a2.

Fixes bug 27247; bugfix on 0.3.0.1-alpha. --- changes/ticket27247 | 5 +++++ src/feature/nodelist/networkstatus.c | 11 ++++++----- 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/changes/ticket27247 b/changes/ticket27247 new file mode 100644 index 000000000..e980913d3 --- /dev/null +++ b/changes/ticket27247 @@ -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. diff --git a/src/feature/nodelist/networkstatus.c b/src/feature/nodelist/networkstatus.c index 6492b828b..4af202166 100644 --- a/src/feature/nodelist/networkstatus.c +++ b/src/feature/nodelist/networkstatus.c @@ -2098,12 +2098,13 @@ networkstatus_set_current_consensus(const char *consensus, }

if (we_want_to_fetch_flavor(options, flav)) { - dirserv_set_cached_consensus_networkstatus(consensus, - flavor, - &c->digests, - c->digest_sha3_as_signed, - c->valid_after); if (dir_server_mode(get_options())) { + dirserv_set_cached_consensus_networkstatus(consensus, + flavor, + &c->digests, + c->digest_sha3_as_signed, + c->valid_after); + consdiffmgr_add_consensus(consensus, c); } }