diff --git a/README.rst b/README.rst
index 39a338c790..8a745259bf 100644
--- a/README.rst
+++ b/README.rst
@@ -565,4 +565,21 @@ sphinxcontrib-napoleon::
Building internal API documentation::
python setup.py build_sphinx
-
\ No newline at end of file
+
+
+
+Halp!! Synapse eats all my RAM!
+===============================
+
+Synapse's architecture is quite RAM hungry currently - we deliberately
+cache a lot of recent room data and metadata in RAM in order to speed up
+common requests. We'll improve this in future, but for now the easiest
+way to either reduce the RAM usage (at the risk of slowing things down)
+is to set the almost-undocumented ``SYNAPSE_CACHE_FACTOR`` environment
+variable. Roughly speaking, a SYNAPSE_CACHE_FACTOR of 1.0 will max out
+at around 3-4GB of resident memory - this is what we currently run the
+matrix.org on. The default setting is currently 0.1, which is probably
+around a ~700MB footprint. You can dial it down further to 0.02 if
+desired, which targets roughly ~512MB. Conversely you can dial it up if
+you need performance for lots of users and have a box with a lot of RAM.
+
diff --git a/jenkins.sh b/jenkins.sh
index 359fd22771..9646ac0b01 100755
--- a/jenkins.sh
+++ b/jenkins.sh
@@ -3,6 +3,7 @@
: ${WORKSPACE:="$(pwd)"}
export PYTHONDONTWRITEBYTECODE=yep
+export SYNAPSE_CACHE_FACTOR=1
# Output test results as junit xml
export TRIAL_FLAGS="--reporter=subunit"
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index d98e80086e..f6cf343174 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -130,6 +130,10 @@ class PresenceHandler(BaseHandler):
for state in active_presence
}
+ metrics.register_callback(
+ "user_to_current_state_size", lambda: len(self.user_to_current_state)
+ )
+
now = self.clock.time_msec()
for state in active_presence:
self.wheel_timer.insert(
diff --git a/synapse/handlers/receipts.py b/synapse/handlers/receipts.py
index de4c694714..935c339707 100644
--- a/synapse/handlers/receipts.py
+++ b/synapse/handlers/receipts.py
@@ -36,8 +36,6 @@ class ReceiptsHandler(BaseHandler):
)
self.clock = self.hs.get_clock()
- self._receipt_cache = None
-
@defer.inlineCallbacks
def received_client_receipt(self, room_id, receipt_type, user_id,
event_id):
diff --git a/synapse/util/caches/descriptors.py b/synapse/util/caches/descriptors.py
index 277854ccbc..35544b19fd 100644
--- a/synapse/util/caches/descriptors.py
+++ b/synapse/util/caches/descriptors.py
@@ -28,6 +28,7 @@ from twisted.internet import defer
from collections import OrderedDict
+import os
import functools
import inspect
import threading
@@ -38,6 +39,9 @@ logger = logging.getLogger(__name__)
_CacheSentinel = object()
+CACHE_SIZE_FACTOR = float(os.environ.get("SYNAPSE_CACHE_FACTOR", 0.1))
+
+
class Cache(object):
def __init__(self, name, max_entries=1000, keylen=1, lru=True, tree=False):
@@ -140,6 +144,8 @@ class CacheDescriptor(object):
"""
def __init__(self, orig, max_entries=1000, num_args=1, lru=True, tree=False,
inlineCallbacks=False):
+ max_entries = int(max_entries * CACHE_SIZE_FACTOR)
+
self.orig = orig
if inlineCallbacks:
diff --git a/synapse/util/caches/stream_change_cache.py b/synapse/util/caches/stream_change_cache.py
index 970488a19c..a1aec7aa55 100644
--- a/synapse/util/caches/stream_change_cache.py
+++ b/synapse/util/caches/stream_change_cache.py
@@ -18,11 +18,15 @@ from synapse.util.caches import cache_counter, caches_by_name
from blist import sorteddict
import logging
+import os
logger = logging.getLogger(__name__)
+CACHE_SIZE_FACTOR = float(os.environ.get("SYNAPSE_CACHE_FACTOR", 0.1))
+
+
class StreamChangeCache(object):
"""Keeps track of the stream positions of the latest change in a set of entities.
@@ -33,7 +37,7 @@ class StreamChangeCache(object):
old then the cache will simply return all given entities.
"""
def __init__(self, name, current_stream_pos, max_size=10000, prefilled_cache={}):
- self._max_size = max_size
+ self._max_size = int(max_size * CACHE_SIZE_FACTOR)
self._entity_to_key = {}
self._cache = sorteddict()
self._earliest_known_stream_pos = current_stream_pos
diff --git a/tests/storage/test_appservice.py b/tests/storage/test_appservice.py
index ed8af10d87..5734198121 100644
--- a/tests/storage/test_appservice.py
+++ b/tests/storage/test_appservice.py
@@ -35,7 +35,8 @@ class ApplicationServiceStoreTestCase(unittest.TestCase):
def setUp(self):
self.as_yaml_files = []
config = Mock(
- app_service_config_files=self.as_yaml_files
+ app_service_config_files=self.as_yaml_files,
+ event_cache_size=1,
)
hs = yield setup_test_homeserver(config=config)
@@ -109,7 +110,8 @@ class ApplicationServiceTransactionStoreTestCase(unittest.TestCase):
self.as_yaml_files = []
config = Mock(
- app_service_config_files=self.as_yaml_files
+ app_service_config_files=self.as_yaml_files,
+ event_cache_size=1,
)
hs = yield setup_test_homeserver(config=config)
self.db_pool = hs.get_db_pool()
@@ -438,7 +440,7 @@ class ApplicationServiceStoreConfigTestCase(unittest.TestCase):
f1 = self._write_config(suffix="1")
f2 = self._write_config(suffix="2")
- config = Mock(app_service_config_files=[f1, f2])
+ config = Mock(app_service_config_files=[f1, f2], event_cache_size=1)
hs = yield setup_test_homeserver(config=config, datastore=Mock())
ApplicationServiceStore(hs)
@@ -448,7 +450,7 @@ class ApplicationServiceStoreConfigTestCase(unittest.TestCase):
f1 = self._write_config(id="id", suffix="1")
f2 = self._write_config(id="id", suffix="2")
- config = Mock(app_service_config_files=[f1, f2])
+ config = Mock(app_service_config_files=[f1, f2], event_cache_size=1)
hs = yield setup_test_homeserver(config=config, datastore=Mock())
with self.assertRaises(ConfigError) as cm:
@@ -464,7 +466,7 @@ class ApplicationServiceStoreConfigTestCase(unittest.TestCase):
f1 = self._write_config(as_token="as_token", suffix="1")
f2 = self._write_config(as_token="as_token", suffix="2")
- config = Mock(app_service_config_files=[f1, f2])
+ config = Mock(app_service_config_files=[f1, f2], event_cache_size=1)
hs = yield setup_test_homeserver(config=config, datastore=Mock())
with self.assertRaises(ConfigError) as cm:
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