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Author: bmomjian

doc/TODO.detail/thread

@@ -378,3 +378,135 @@ mkscott@sacadia.com
 
 
 
+From pgsql-hackers-owner+M4304@postgresql.org Tue Feb  6 10:24:21 2001
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+Date: Tue, 6 Feb 2001 07:05:04 -0800 (PST)
+From: Myron Scott <mscott@sacadia.com>
+X-Sender: mscott@goldengate.kojoworldwide.com.
+To: Karel Zak <zakkr@zf.jcu.cz>
+cc: pgsql-hackers@postgresql.org
+Subject: Re: [HACKERS] Using Threads
+In-Reply-To: <Pine.LNX.3.96.1010206101030.20355B-100000@ara.zf.jcu.cz>
+Message-ID: <Pine.GSO.4.10.10102060650250.4153-100000@goldengate.kojoworldwide.com.>
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+Status: OR
+
+
+> 
+>  Sorry I haven't time to see and test your experiment,
+> but I have a question. How you solve memory management?
+> The current mmgr is based on global variable 
+> CurrentMemoryContext that is very often changed and used.
+>  Use you for this locks? If yes it is probably problematic
+> point for perfomance.
+> 
+> 			Karel
+> 
+
+There are many many globals I had to work around including all the memory
+management stuff.  I basically threw everything into and "environment"
+variable which I stored in a thread specific using thr_setspecific.
+
+Performance is acually very good for what I am doing.  I was able to batch
+commit transactions which cuts down on fsync calls, use prepared
+statements from my client using CORBA, and the various locking calls for
+the threads (cond_wait,mutex_lock, and sema_wait) seem pretty fast.  I did
+some performance tests for inserts 
+
+20 clients, 900 inserts per client, 1 insert per transaction, 4 different
+tables.
+
+7.0.2    About    10:52 average completion
+multi-threaded    2:42 average completion
+7.1beta3          1:13 average completion
+
+If I increased the number of inserts per transaction, multi-threaded got
+closer to 7.1 for inserts.  I haven't tested other other types of
+commands
+yet.
+
+
+Myron Scott
+mkscott@sacadia.com
+
+
+From pgsql-hackers-owner+M4313@postgresql.org Tue Feb  6 12:32:00 2001
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+	Tue, 6 Feb 2001 18:31:02 +0100
+Date: Tue, 6 Feb 2001 18:31:02 +0100 (CET)
+From: Karel Zak <zakkr@zf.jcu.cz>
+To: Myron Scott <mscott@sacadia.com>
+cc: pgsql-hackers@postgresql.org
+Subject: Re: [HACKERS] Using Threads
+In-Reply-To: <Pine.GSO.4.10.10102060650250.4153-100000@goldengate.kojoworldwide.com.>
+Message-ID: <Pine.LNX.3.96.1010206182112.3799B-100000@ara.zf.jcu.cz>
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+
+
+On Tue, 6 Feb 2001, Myron Scott wrote:
+
+> There are many many globals I had to work around including all the memory
+> management stuff.  I basically threw everything into and "environment"
+> variable which I stored in a thread specific using thr_setspecific.
+
+ Yes, it's good. I working on multi-thread application server
+(http://mape.jcu.cz) and I use for this project some things from PG (like
+mmgr), I planning use same solution.
+
+> Performance is acually very good for what I am doing.  I was able to batch
+> commit transactions which cuts down on fsync calls, use prepared
+> statements from my client using CORBA, and the various locking calls for
+> the threads (cond_wait,mutex_lock, and sema_wait) seem pretty fast.  I did
+> some performance tests for inserts 
+> 
+> 20 clients, 900 inserts per client, 1 insert per transaction, 4 different
+> tables.
+> 
+> 7.0.2    About    10:52 average completion
+> multi-threaded    2:42 average completion
+> 7.1beta3          1:13 average completion
+
+It is very very good for time for 7.1, already look forward to 7.2! :-)  
+
+ BTW, I not sure if you anytime in future will see threads in 
+official PostgreSQL and if you spending time on relevant things (IMHO).
+
+		Karel
+
+
+
+
+
+