Hi Wlad,

Thanks for fixing this issue. :-)


About thread-pool, the implementation of IOCP on AIX has limitations. That 
works ONLY with Asynchronous I/O (AIO).


On AIX, we have the pollset API. Within our port of Go on AIX, we did not use 
pollset since Go wants netpoll to be edge-triggered (epoll with EPOLLET flag) 
and not level-triggered. However, this is very unefficient to implement 
edge-triggerered behavior with pollset (one has to continuously modify the 
pollset, destroying the performance).


So, we have to understand if MariaDB requires edge-triggered or 
level-triggered. Do you know?


Thanks/Regards,


Cordialement,

Tony Reix

tony.r...@atos.net

ATOS / Bull SAS
ATOS Expert
IBM Coop Architect & Technical Leader
Office : +33 (0) 4 76 29 72 67
1 rue de Provence - 38432 Échirolles - France
www.atos.net<https://mail.ad.bull.net/owa/redir.aspx?C=PvphmPvCZkGrAgHVnWGsdMcDKgzl_dEIsM6rX0g4u4v8V81YffzBGkWrtQeAXNovd3ttkJL8JIc.&URL=http%3a%2f%2fwww.atos.net%2f>


________________________________
De : Vladislav Vaintroub <vvaintr...@gmail.com>
Envoyé : jeudi 18 avril 2019 11:54
À : REIX, Tony; maria-developers@lists.launchpad.net
Objet : RE: [Maria-developers] MariaDB 10.4 on AIX. Issue with: 
HAVE_POOL_OF_THREADS


Hi Tony,



I fixed this in 
https://jira.mariadb.org/browse/MDEV-19274<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fjira.mariadb.org%2Fbrowse%2FMDEV-19274&data=02%7C01%7Ctony.reix%40atos.net%7Cb5e9b806e428485b785c08d6c3e3e1b8%7C33440fc6b7c7412cbb730e70b0198d5a%7C0%7C0%7C636911780844412005&sdata=XWFIvR5T9zP4eR%2F5Jqwb1%2FoFvr809azhFplEtSGy4R4%3D&reserved=0>
 .



I do not think it makes a lot of sense to implement generic, poll()-based 
threadpool . epoll-like APIs exists almost everywhere, except  very exotic (for 
MariaDB) platforms we do not build on.



I googled, and I found that AIX has  Windows-like IOCP with 
GetQueuedCompletionStatus/CreateIoCompletionPort etc. Maybe, it does not behave 
exactly like on Windows, but perhaps you can figure out what’s the difference 
and  what is required to port that code.



Regards,

Wlad



From: REIX, Tony<mailto:tony.r...@atos.net>
Sent: Tuesday, 16 April 2019 11:26
To: 
maria-developers@lists.launchpad.net<mailto:maria-developers@lists.launchpad.net>
Subject: [Maria-developers] MariaDB 10.4 on AIX. Issue with: 
HAVE_POOL_OF_THREADS



Hi,

In my environment (AIX & MariaDB v10.4.3 or 10.4.4), I have an issue with 
HAVE_POOL_OF_THREADS.

When building, I have the following trace and error (full line of g++ 
compilation at end of email) :

[ 44%] Linking CXX executable explain_filename-t
/opt/freeware/bin/cmake -E cmake_link_script 
CMakeFiles/explain_filename-t.dir/link.txt --verbose=1
/opt/freeware/bin/g++ ...........  -o explain_filename-t ....
ld: 0711-317 ERROR: Undefined symbol: .TP_pool_generic::TP_pool_generic()
ld: 0711-317 ERROR: Undefined symbol: .TP_pool_generic::init()

This seems to be due to the following lines of the file:
sql/CMakeLists.txt :

  IF (CMAKE_SYSTEM_NAME MATCHES "Linux" OR
      CMAKE_SYSTEM_NAME MATCHES "Windows" OR
      CMAKE_SYSTEM_NAME MATCHES "SunOS" OR
      HAVE_KQUEUE)
   ADD_DEFINITIONS(-DHAVE_POOL_OF_THREADS)
   IF(WIN32)
     SET(SQL_SOURCE ${SQL_SOURCE} threadpool_win.cc)
   ENDIF()
   SET(SQL_SOURCE ${SQL_SOURCE} threadpool_generic.cc)
  ENDIF()

In case the Operating System is not Linux, Windows, or SunOS, then there is NO  
-DHAVE_POOL_OF_THREADS  and the file: threadpool_generic.cc is NOT compiled.

However, the C++ code of MariaDB still looks at least for 2 routines of 
threadpool_generic.cc  :
  TP_pool_generic::TP_pool_generic()
  TP_pool_generic::init()
but these routines are not available since threadpool_generic.cc was not 
compiled.

So, in my opinion, there are some #ifdef HAVE_POOL_OF_THREADS  lines that are 
missing in common threadpool code that would prevent to use threadpool generic 
routines.
However, I do not master this code.


Why not implement on AIX the generic pool of thread and thus add AIX to the 
above IF( ) test of sql/CMakeLists.txt ??
The reason if that, out of the 4 possibilities listed in 
sql/threadpool_generic.cc : epoll, KQUEUE, port, and IOCP, none of them are 
available on AIX with the EXACT required behavior. We have to implement 
something miming epoll(), we think. Before fixing this performance improvement, 
we'd like to be able to build & test MariaDB for all its other features.

sql/threadpool_generic.cc :
  #ifdef __linux__
    #include <sys/epoll.h>
    typedef struct epoll_event native_event;
  #elif defined(HAVE_KQUEUE)
    #include <sys/event.h>
    typedef struct kevent native_event;
  #elif defined (__sun)
    #include <port.h>
    typedef port_event_t native_event;
  #elif defined (HAVE_IOCP)
    typedef OVERLAPPED_ENTRY native_event;
  #else
  #error threadpool is not available on this platform          <<---- AIX
  #endif


Regards,

Tony


/opt/freeware/bin/g++
        -O2
        -g
        -L/opt/freeware/lib64
        -D_GNU_SOURCE
        -D_FILE_OFFSET_BITS=64
        -D_LARGEFILE_SOURCE
        -maix64
        -Wl,-bbigtoc
        -fPIC
        -O2
        -g
        -L/opt/freeware/lib64
        -D_GNU_SOURCE
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        -maix64
        -Wl,-bbigtoc
        -fPIC
        -pie
        -fPIC
        -fno-rtti
        -O3
        -g
        -static-libgcc
        -fno-omit-frame-pointer
        -fno-strict-aliasing
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        -Wl,-blibpath:/opt/freeware/lib:/opt/freeware/lib64:/usr/lib:/lib
        -lpgport
        CMakeFiles/explain_filename-t.dir/explain_filename-t.cc.o
        -o
        explain_filename-t
        -Wl,-bnoipath
        
-Wl,-blibpath:/opt/freeware/lib64:/opt/freeware/lib/gcc/powerpc-ibm-aix7.2.0.0/8.2.0/ppc64:/opt/freeware/lib/ppc64:/opt/freeware/lib/gcc/powerpc-ibm-aix7.2.0.0/8.2.0:/opt/freeware/lib:/usr/lib:/lib
        -lpthreads
        ../../sql/libsql.a
        ../mytap/libmytap.a
        ../../storage/archive/libarchive.a
        ../../storage/blackhole/libblackhole.a
        ../../storage/csv/libcsv.a
        ../../storage/federatedx/libfederatedx.a
        ../../storage/heap/libheap.a
        ../../storage/innobase/libinnobase.a
        -llz4
        ../../storage/maria/libaria.a
        ../../storage/myisam/libmyisam.a
        ../../storage/myisammrg/libmyisammrg.a
        ../../storage/sequence/libsequence.a
        ../../plugin/feedback/libfeedback.a
        ../../plugin/user_variables/libuser_variables.a
        ../../plugin/userstat/libuserstat.a
        ../../sql/libpartition.a
        ../../sql/libsql_sequence.a
        ../../mysys/libmysys.a
        ../../mysys_ssl/libmysys_ssl.a
        ../../dbug/libdbug.a
        ../../mysys/libmysys.a
        ../../mysys_ssl/libmysys_ssl.a
        ../../dbug/libdbug.a
        /usr/lib64/libz.so
        -lm
        ../../extra/yassl/libyassl.a
        ../../extra/yassl/taocrypt/libtaocrypt.a
        ../../strings/libstrings.a
        ../../vio/libvio.a
        ../../pcre/libpcre.a
        ../../wsrep-lib/src/libwsrep-lib.a
        -lpthread
        -ldl
        ../../wsrep-lib/wsrep-API/libwsrep_api_v26.a
        -lpthreads

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