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Posted to dev@couchdb.apache.org by "Filipe Manana (JIRA)" <ji...@apache.org> on 2011/01/03 14:44:45 UTC
[jira] Created: (COUCHDB-1009) Make couch_stream buffer
configurable
Make couch_stream buffer configurable
-------------------------------------
Key: COUCHDB-1009
URL: https://issues.apache.org/jira/browse/COUCHDB-1009
Project: CouchDB
Issue Type: Improvement
Components: Database Core
Environment: trunk
Reporter: Filipe Manana
Assignee: Filipe Manana
Priority: Trivial
Attachments: COUCHDB-1009.patch
The couch_stream buffer is hardcoded to 4Kb.
This value should be configurable. Larger values can improve write and specially read performance (if we write larger chunks to disk, we have higher chances of reading more contiguous disk blocks afterwards).
I also think it's a good idea to change the default value from 4Kb to something higher (64Kb for e.g.).
Patch attached
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[jira] Commented: (COUCHDB-1009) Make couch_stream buffer
configurable
Posted by "Robert Newson (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COUCHDB-1009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12976806#action_12976806 ]
Robert Newson commented on COUCHDB-1009:
----------------------------------------
for attachment heavy scenarios, perhaps resolving COUCHDB-769 would obviate any need to get this size 'just right'?
a 28% improvement for a 16x increase in chunk size strikes me as weak, btw. When I tried this experiment before, I emitted the actual sizes of the chunks that were getting written (64kib simply being the maximum size). Have you verified that you actually write 64kib chunks rather than merely accept them?
In any case, changing the default should be a separate commit to the commit that makes this setting configurable.
> Make couch_stream buffer configurable
> -------------------------------------
>
> Key: COUCHDB-1009
> URL: https://issues.apache.org/jira/browse/COUCHDB-1009
> Project: CouchDB
> Issue Type: Improvement
> Components: Database Core
> Environment: trunk
> Reporter: Filipe Manana
> Assignee: Filipe Manana
> Priority: Trivial
> Attachments: COUCHDB-1009.patch
>
>
> The couch_stream buffer is hardcoded to 4Kb.
> This value should be configurable. Larger values can improve write and specially read performance (if we write larger chunks to disk, we have higher chances of reading more contiguous disk blocks afterwards).
> I also think it's a good idea to change the default value from 4Kb to something higher (64Kb for e.g.).
> Patch attached
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[jira] [Resolved] (COUCHDB-1009) Make couch_stream buffer
configurable
Posted by "Filipe Manana (Resolved) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COUCHDB-1009?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Filipe Manana resolved COUCHDB-1009.
------------------------------------
Resolution: Fixed
Applied to master.
> Make couch_stream buffer configurable
> -------------------------------------
>
> Key: COUCHDB-1009
> URL: https://issues.apache.org/jira/browse/COUCHDB-1009
> Project: CouchDB
> Issue Type: Improvement
> Components: Database Core
> Environment: trunk
> Reporter: Filipe Manana
> Assignee: Filipe Manana
> Priority: Trivial
> Attachments: COUCHDB-1009-2.patch, COUCHDB-1009-rebased.patch, COUCHDB-1009.patch
>
>
> The couch_stream buffer is hardcoded to 4Kb.
> This value should be configurable. Larger values can improve write and specially read performance (if we write larger chunks to disk, we have higher chances of reading more contiguous disk blocks afterwards).
> I also think it's a good idea to change the default value from 4Kb to something higher (64Kb for e.g.).
> Patch attached
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[jira] Commented: (COUCHDB-1009) Make couch_stream buffer
configurable
Posted by "Benoit Chesneau (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COUCHDB-1009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12976739#action_12976739 ]
Benoit Chesneau commented on COUCHDB-1009:
------------------------------------------
sound good for me.
> Make couch_stream buffer configurable
> -------------------------------------
>
> Key: COUCHDB-1009
> URL: https://issues.apache.org/jira/browse/COUCHDB-1009
> Project: CouchDB
> Issue Type: Improvement
> Components: Database Core
> Environment: trunk
> Reporter: Filipe Manana
> Assignee: Filipe Manana
> Priority: Trivial
> Attachments: COUCHDB-1009.patch
>
>
> The couch_stream buffer is hardcoded to 4Kb.
> This value should be configurable. Larger values can improve write and specially read performance (if we write larger chunks to disk, we have higher chances of reading more contiguous disk blocks afterwards).
> I also think it's a good idea to change the default value from 4Kb to something higher (64Kb for e.g.).
> Patch attached
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[jira] Commented: (COUCHDB-1009) Make couch_stream buffer
configurable
Posted by "Filipe Manana (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COUCHDB-1009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12976759#action_12976759 ]
Filipe Manana commented on COUCHDB-1009:
----------------------------------------
Just by increasing the buffer size from 4Kb to 64Kb, for the same attachment upload, I got a reduction from 1545051 us to 1206335 us.
It's not that much, but I believe this stresses less the file driver. Writing larger chunks is usually better than writing many small chunks (reduces number of context switches, better chances of having contiguous blocks allocated by the filesystem). Plus, after file:allocate/2 lands in OTP, it will be better to use it with even larger sizes (512Kb, 1Mb for example).
For e.g., running the test function at https://github.com/fdmanana/couchdb/commit/6ee38e330aa5bff51d58470cba1096f01aa0dfbd#L2R39
Erlang R14B01 (erts-5.8.2) [source] [smp:2:2] [rq:2] [async-threads:4] [hipe] [kernel-poll:true]
Eshell V5.8.2 (abort with ^G)
1> Apache CouchDB 1.2.0a13d6dd1-git (LogLevel=info) is starting.
Apache CouchDB has started. Time to relax.
[info] [<0.37.0>] Apache CouchDB has started on http://127.0.0.1:5984/
1> couch_file:test(4096, 16).
multi writes of 16 binaries, each of size 4096 bytes, took 870us
batch write of 16 binaries, each of size 4096 bytes, took 377us
ok
2> couch_file:test(4096, 16).
multi writes of 16 binaries, each of size 4096 bytes, took 1271us
batch write of 16 binaries, each of size 4096 bytes, took 366us
> Make couch_stream buffer configurable
> -------------------------------------
>
> Key: COUCHDB-1009
> URL: https://issues.apache.org/jira/browse/COUCHDB-1009
> Project: CouchDB
> Issue Type: Improvement
> Components: Database Core
> Environment: trunk
> Reporter: Filipe Manana
> Assignee: Filipe Manana
> Priority: Trivial
> Attachments: COUCHDB-1009.patch
>
>
> The couch_stream buffer is hardcoded to 4Kb.
> This value should be configurable. Larger values can improve write and specially read performance (if we write larger chunks to disk, we have higher chances of reading more contiguous disk blocks afterwards).
> I also think it's a good idea to change the default value from 4Kb to something higher (64Kb for e.g.).
> Patch attached
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[jira] [Commented] (COUCHDB-1009) Make couch_stream buffer
configurable
Posted by "Filipe Manana (Commented) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COUCHDB-1009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13139626#comment-13139626 ]
Filipe Manana commented on COUCHDB-1009:
----------------------------------------
Thanks for reminding about this Jan.
Regarding your question, no it's not needed. For each attachment we write, we instantiate a couch_stream gen_server, which is then closed after writing the attachment. Therefore once the .ini parameter is updated, it only affects subsequent attachment writes. I think this is perfectly fine.
> Make couch_stream buffer configurable
> -------------------------------------
>
> Key: COUCHDB-1009
> URL: https://issues.apache.org/jira/browse/COUCHDB-1009
> Project: CouchDB
> Issue Type: Improvement
> Components: Database Core
> Environment: trunk
> Reporter: Filipe Manana
> Assignee: Filipe Manana
> Priority: Trivial
> Attachments: COUCHDB-1009-2.patch, COUCHDB-1009-rebased.patch, COUCHDB-1009.patch
>
>
> The couch_stream buffer is hardcoded to 4Kb.
> This value should be configurable. Larger values can improve write and specially read performance (if we write larger chunks to disk, we have higher chances of reading more contiguous disk blocks afterwards).
> I also think it's a good idea to change the default value from 4Kb to something higher (64Kb for e.g.).
> Patch attached
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[jira] Commented: (COUCHDB-1009) Make couch_stream buffer
configurable
Posted by "Filipe Manana (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COUCHDB-1009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12976818#action_12976818 ]
Filipe Manana commented on COUCHDB-1009:
----------------------------------------
COUCHDB-769 is a totally different matter I think, not to mention that it's a very big change, has many implications that the patch doesn't address and as far as I can tell, there aren't short or medium term plans to add it to CouchDB.
And yes it writes 64Kb (or more) chunks to the file. couch_stream buffers the received data until it reaches or exceeds the buffer size.
I have no objections about leaving it as 4Kb.
> Make couch_stream buffer configurable
> -------------------------------------
>
> Key: COUCHDB-1009
> URL: https://issues.apache.org/jira/browse/COUCHDB-1009
> Project: CouchDB
> Issue Type: Improvement
> Components: Database Core
> Environment: trunk
> Reporter: Filipe Manana
> Assignee: Filipe Manana
> Priority: Trivial
> Attachments: COUCHDB-1009.patch
>
>
> The couch_stream buffer is hardcoded to 4Kb.
> This value should be configurable. Larger values can improve write and specially read performance (if we write larger chunks to disk, we have higher chances of reading more contiguous disk blocks afterwards).
> I also think it's a good idea to change the default value from 4Kb to something higher (64Kb for e.g.).
> Patch attached
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[jira] Commented: (COUCHDB-1009) Make couch_stream buffer
configurable
Posted by "Adam Kocoloski (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COUCHDB-1009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12976784#action_12976784 ]
Adam Kocoloski commented on COUCHDB-1009:
-----------------------------------------
I would certainly not want to block the FD process for a network data transfer, but I think that's easy to avoid.
> Make couch_stream buffer configurable
> -------------------------------------
>
> Key: COUCHDB-1009
> URL: https://issues.apache.org/jira/browse/COUCHDB-1009
> Project: CouchDB
> Issue Type: Improvement
> Components: Database Core
> Environment: trunk
> Reporter: Filipe Manana
> Assignee: Filipe Manana
> Priority: Trivial
> Attachments: COUCHDB-1009.patch
>
>
> The couch_stream buffer is hardcoded to 4Kb.
> This value should be configurable. Larger values can improve write and specially read performance (if we write larger chunks to disk, we have higher chances of reading more contiguous disk blocks afterwards).
> I also think it's a good idea to change the default value from 4Kb to something higher (64Kb for e.g.).
> Patch attached
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[jira] [Updated] (COUCHDB-1009) Make couch_stream buffer
configurable
Posted by "Jan Lehnardt (Updated) (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COUCHDB-1009?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jan Lehnardt updated COUCHDB-1009:
----------------------------------
Attachment: COUCHDB-1009-rebased.patch
Rebased against master.
@FIlipe, don't we need to listen to config changes and restart or reconfigure the gen_server or its state with the new config value?
> Make couch_stream buffer configurable
> -------------------------------------
>
> Key: COUCHDB-1009
> URL: https://issues.apache.org/jira/browse/COUCHDB-1009
> Project: CouchDB
> Issue Type: Improvement
> Components: Database Core
> Environment: trunk
> Reporter: Filipe Manana
> Assignee: Filipe Manana
> Priority: Trivial
> Attachments: COUCHDB-1009-2.patch, COUCHDB-1009-rebased.patch, COUCHDB-1009.patch
>
>
> The couch_stream buffer is hardcoded to 4Kb.
> This value should be configurable. Larger values can improve write and specially read performance (if we write larger chunks to disk, we have higher chances of reading more contiguous disk blocks afterwards).
> I also think it's a good idea to change the default value from 4Kb to something higher (64Kb for e.g.).
> Patch attached
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[jira] Commented: (COUCHDB-1009) Make couch_stream buffer
configurable
Posted by "Robert Newson (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COUCHDB-1009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12976762#action_12976762 ]
Robert Newson commented on COUCHDB-1009:
----------------------------------------
"it will be better to use it with even larger sizes (512Kb, 1Mb for example). "
Except that this will block concurrent writers from making progress (I need *you* to transmit 1mb before I can transmit my 1mb), etc.
Increasing from 4k seems a no-brainer to me though when I experimented with larger buffer sizes a while ago (a year?) I found that things were little improved, matching your numbers.
I would be interested in knowing if it helps with compaction, though, since reading and writing larger attachment blocks should really help.
> Make couch_stream buffer configurable
> -------------------------------------
>
> Key: COUCHDB-1009
> URL: https://issues.apache.org/jira/browse/COUCHDB-1009
> Project: CouchDB
> Issue Type: Improvement
> Components: Database Core
> Environment: trunk
> Reporter: Filipe Manana
> Assignee: Filipe Manana
> Priority: Trivial
> Attachments: COUCHDB-1009.patch
>
>
> The couch_stream buffer is hardcoded to 4Kb.
> This value should be configurable. Larger values can improve write and specially read performance (if we write larger chunks to disk, we have higher chances of reading more contiguous disk blocks afterwards).
> I also think it's a good idea to change the default value from 4Kb to something higher (64Kb for e.g.).
> Patch attached
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[jira] Updated: (COUCHDB-1009) Make couch_stream buffer
configurable
Posted by "Filipe Manana (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COUCHDB-1009?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Filipe Manana updated COUCHDB-1009:
-----------------------------------
Attachment: COUCHDB-1009-2.patch
Robert,
Do you agree with the .ini comment on this second patch?
diff --git a/etc/couchdb/default.ini.tpl.in b/etc/couchdb/default.ini.tpl.in
index 4c4d905..e1c1b4d 100644
--- a/etc/couchdb/default.ini.tpl.in
+++ b/etc/couchdb/default.ini.tpl.in
@@ -11,6 +11,10 @@ os_process_timeout = 5000 ; 5 seconds. for view and external servers.
max_dbs_open = 100
delayed_commits = true ; set this to false to ensure an fsync before 201 Created is returned
uri_file = %localstaterundir%/couch.uri
+; Higher values may give better read performance due to less read operations
+; and/or more OS page cache hits, but they can also increase overall response
+; time for writes when there are many write requests in parallel.
+attachment_stream_buffer_size = 4096
> Make couch_stream buffer configurable
> -------------------------------------
>
> Key: COUCHDB-1009
> URL: https://issues.apache.org/jira/browse/COUCHDB-1009
> Project: CouchDB
> Issue Type: Improvement
> Components: Database Core
> Environment: trunk
> Reporter: Filipe Manana
> Assignee: Filipe Manana
> Priority: Trivial
> Attachments: COUCHDB-1009-2.patch, COUCHDB-1009.patch
>
>
> The couch_stream buffer is hardcoded to 4Kb.
> This value should be configurable. Larger values can improve write and specially read performance (if we write larger chunks to disk, we have higher chances of reading more contiguous disk blocks afterwards).
> I also think it's a good idea to change the default value from 4Kb to something higher (64Kb for e.g.).
> Patch attached
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[jira] Commented: (COUCHDB-1009) Make couch_stream buffer
configurable
Posted by "Filipe Manana (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COUCHDB-1009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12976764#action_12976764 ]
Filipe Manana commented on COUCHDB-1009:
----------------------------------------
That's absolutely right Robert. But it might depend on the number of concurrent writers one expects, the size of the attachments and documents added/updated, etc. And that's another reason I think why it should be configurable and not hardcoded.
> Make couch_stream buffer configurable
> -------------------------------------
>
> Key: COUCHDB-1009
> URL: https://issues.apache.org/jira/browse/COUCHDB-1009
> Project: CouchDB
> Issue Type: Improvement
> Components: Database Core
> Environment: trunk
> Reporter: Filipe Manana
> Assignee: Filipe Manana
> Priority: Trivial
> Attachments: COUCHDB-1009.patch
>
>
> The couch_stream buffer is hardcoded to 4Kb.
> This value should be configurable. Larger values can improve write and specially read performance (if we write larger chunks to disk, we have higher chances of reading more contiguous disk blocks afterwards).
> I also think it's a good idea to change the default value from 4Kb to something higher (64Kb for e.g.).
> Patch attached
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[jira] Commented: (COUCHDB-1009) Make couch_stream buffer
configurable
Posted by "Robert Newson (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COUCHDB-1009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12998414#comment-12998414 ]
Robert Newson commented on COUCHDB-1009:
----------------------------------------
Good comment, yeah.
My testing didn't show any compelling reason to increase this value, though, but at least this way it's not hardcoded.
> Make couch_stream buffer configurable
> -------------------------------------
>
> Key: COUCHDB-1009
> URL: https://issues.apache.org/jira/browse/COUCHDB-1009
> Project: CouchDB
> Issue Type: Improvement
> Components: Database Core
> Environment: trunk
> Reporter: Filipe Manana
> Assignee: Filipe Manana
> Priority: Trivial
> Attachments: COUCHDB-1009-2.patch, COUCHDB-1009.patch
>
>
> The couch_stream buffer is hardcoded to 4Kb.
> This value should be configurable. Larger values can improve write and specially read performance (if we write larger chunks to disk, we have higher chances of reading more contiguous disk blocks afterwards).
> I also think it's a good idea to change the default value from 4Kb to something higher (64Kb for e.g.).
> Patch attached
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[jira] Commented: (COUCHDB-1009) Make couch_stream buffer
configurable
Posted by "Filipe Manana (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COUCHDB-1009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12976802#action_12976802 ]
Filipe Manana commented on COUCHDB-1009:
----------------------------------------
Adam, do you think 64Kb is too much for most scenarios?
I don't mind at all to leave this as 4Kb .
> Make couch_stream buffer configurable
> -------------------------------------
>
> Key: COUCHDB-1009
> URL: https://issues.apache.org/jira/browse/COUCHDB-1009
> Project: CouchDB
> Issue Type: Improvement
> Components: Database Core
> Environment: trunk
> Reporter: Filipe Manana
> Assignee: Filipe Manana
> Priority: Trivial
> Attachments: COUCHDB-1009.patch
>
>
> The couch_stream buffer is hardcoded to 4Kb.
> This value should be configurable. Larger values can improve write and specially read performance (if we write larger chunks to disk, we have higher chances of reading more contiguous disk blocks afterwards).
> I also think it's a good idea to change the default value from 4Kb to something higher (64Kb for e.g.).
> Patch attached
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[jira] Updated: (COUCHDB-1009) Make couch_stream buffer
configurable
Posted by "Filipe Manana (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COUCHDB-1009?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Filipe Manana updated COUCHDB-1009:
-----------------------------------
Attachment: COUCHDB-1009.patch
> Make couch_stream buffer configurable
> -------------------------------------
>
> Key: COUCHDB-1009
> URL: https://issues.apache.org/jira/browse/COUCHDB-1009
> Project: CouchDB
> Issue Type: Improvement
> Components: Database Core
> Environment: trunk
> Reporter: Filipe Manana
> Assignee: Filipe Manana
> Priority: Trivial
> Attachments: COUCHDB-1009.patch
>
>
> The couch_stream buffer is hardcoded to 4Kb.
> This value should be configurable. Larger values can improve write and specially read performance (if we write larger chunks to disk, we have higher chances of reading more contiguous disk blocks afterwards).
> I also think it's a good idea to change the default value from 4Kb to something higher (64Kb for e.g.).
> Patch attached
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[jira] Commented: (COUCHDB-1009) Make couch_stream buffer
configurable
Posted by "Robert Newson (JIRA)" <ji...@apache.org>.
[ https://issues.apache.org/jira/browse/COUCHDB-1009?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12976768#action_12976768 ]
Robert Newson commented on COUCHDB-1009:
----------------------------------------
Agree it should be configurable, all I'm saying is that this setting has inherent limits. The doc for the setting should point out the down side and we can let people choose for themselves.
> Make couch_stream buffer configurable
> -------------------------------------
>
> Key: COUCHDB-1009
> URL: https://issues.apache.org/jira/browse/COUCHDB-1009
> Project: CouchDB
> Issue Type: Improvement
> Components: Database Core
> Environment: trunk
> Reporter: Filipe Manana
> Assignee: Filipe Manana
> Priority: Trivial
> Attachments: COUCHDB-1009.patch
>
>
> The couch_stream buffer is hardcoded to 4Kb.
> This value should be configurable. Larger values can improve write and specially read performance (if we write larger chunks to disk, we have higher chances of reading more contiguous disk blocks afterwards).
> I also think it's a good idea to change the default value from 4Kb to something higher (64Kb for e.g.).
> Patch attached
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