[couchdb] branch ioq-in-tree updated: Configure IOQ defaults

[ko...@apache.org]

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kocolosk pushed a commit to branch ioq-in-tree
in repository https://gitbox.apache.org/repos/asf/couchdb.git


The following commit(s) were added to refs/heads/ioq-in-tree by this push:
     new 5736df7  Configure IOQ defaults
5736df7 is described below

commit 5736df7f9d0c2c8560b2ce2cda0b87684953fd7a
Author: Adam Kocoloski <ko...@apache.org>
AuthorDate: Mon Jan 6 13:46:24 2020 -0500

    Configure IOQ defaults
---
 rel/overlay/etc/default.ini | 34 ++++++++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/rel/overlay/etc/default.ini b/rel/overlay/etc/default.ini
index a1df080..f5f0578 100644
--- a/rel/overlay/etc/default.ini
+++ b/rel/overlay/etc/default.ini
@@ -512,6 +512,40 @@ min_priority = 2.0
 [smoosh.ratio_views]
 min_priority = 2.0
 
+[ioq]
+; The maximum number of concurrent in-flight IO requests that
+concurrency = 10
+
+; The fraction of the time that a background IO request will be selected
+; over an interactive IO request when both queues are non-empty
+ratio = 0.01
+
+[ioq.bypass]
+; System administrators can choose to submit specific classes of IO directly
+; to the underlying file descriptor or OS process, bypassing the queues
+; altogether. Installing a bypass can yield higher throughput and lower
+; latency, but relinquishes some control over prioritization. The following
+; classes are recognized with the following defaults:
+
+; Messages on their way to an external process (e.g., couchjs) are bypassed
+os_process = true
+
+; Disk IO fulfilling interactive read requests is bypassed
+read = true
+
+; Disk IO required to update a database is bypassed
+write = true
+
+; Disk IO required to update views and other secondary indexes is bypassed
+view_update = true
+
+; Disk IO issued by the background replication processes that fix any
+; inconsistencies between shard copies is queued
+shard_sync = false
+
+; Disk IO issued by compaction jobs is queued
+compaction = false
+
 [dreyfus]
 ; The name and location of the Clouseau Java service required to
 ; enable Search functionality.