[Monetdb-developers] Concurrency Problem Mserver

24 Nov 2006


      Hello everybody,
as I am trying to get some experiments with PFTijah to work I
encountered endless loops while executing some queries. Setting
the debug_level to 1024 gave me a list of locks which were obviously
competing about some resource. The attachment tries to describe what
the start parameters, inputs and the log messages were.
Can somebody tell me whether that is a problem of mine, or a common
one? And what a good approach to fix it would be.
Best regards & fijn weekend
Robin
-- 
Robin Aly (PhD student, University Twente)
Phone: +31 (53) 489 4520
Fax:   +31 (53) 489 2927
email: r.aly@ewi.utwente.nl


gdb -args Mserver --set monet_daemon=yes --dbinit="module(pftijah); mil_start();"


/tmp/trec${i}.xq=
let $opt := <TijahOptions returnNumber="1000" collection="PFX" algebraType="COARSE2" txtmodel_model="NLLR"/>
for $q in doc("/local/alyr/dev/eval/clef-clsr-2006/clef-malach/topics/evaluation2006-en.xml")//top[3]
  let $q_text := pf:tijah-tokenize(exactly-one($q/title/text()))
  let $q_nexi := concat("//DOC[about(.,", $q_text, ")];")
  let $q_num := $q/num/text()
  let $result := pf:tijah-query-id($opt, (), $q_nexi)
  for $doc at $rank in pf:tijah-nodes($result)
    return
      string-join(($q_num, "Q0", $doc/DOCNO/text(), string($rank),
      string(pf:tijah-score($result, $doc)), "UTallEN"), " ")

MapiClient -l xquery </tmp/trec${i}.xq 

Output
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)
getRequest: MT_set_lock(0xb7e305ec)
getRequest: MT_up_sema(0xb7e30604)
getRequest: MT_unset_lock(0xb7e305ec)
getRequest: MT_down_sema(0xb7e30604)