From: Ole John Aske
Date: June 18 2012 1:56pm
Subject: bzr push into mysql-5.5-cluster-7.2 branch (ole.john.aske:3941 to 3942)
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 3942 Ole John Aske	2012-06-18
      Follow up fix to Mikael R's 4G, savemem.patch:
      
      We originally assumed that a specific TC did not communicate with other TCs.
      However, the SPJ block is located in the same block-thread as the TCs.
      
      TC *will* communicate with all SPJ blocks, which should be counted as
      a full TC <-> TC cross communication.

    modified:
      storage/ndb/src/kernel/vm/mt.cpp
 3941 Martin Skold	2012-06-15 [merge]
      Merge from 7.1

    modified:
      mysql-test/suite/ndb/r/ndb_index_stat_restart.result
      mysql-test/suite/ndb/t/ndb_reconnect.test
=== modified file 'storage/ndb/src/kernel/vm/mt.cpp'
--- a/storage/ndb/src/kernel/vm/mt.cpp	2012-05-23 06:40:37 +0000
+++ b/storage/ndb/src/kernel/vm/mt.cpp	2012-06-18 13:54:07 +0000
@@ -4106,10 +4106,10 @@ may_communicate(unsigned from, unsigned 
   }
   else if (is_tc_thread(from))
   {
-    // TC threads can communicate with LQH-, main- and itself
+    // TC threads can communicate with SPJ-, LQH-, main- and itself
     return is_main_thread(to) ||
            is_ldm_thread(to)  ||
-           (to == from);
+           is_tc_thread(to);      // Cover both SPJs and itself 
   }
   else
   {
@@ -4426,12 +4426,13 @@ compute_jb_pages(struct EmulatorData * e
          job_queue_pages_per_thread;
 
   /**
-   * TC threads can communicate with LQH threads and main threads.
+   * TC threads can communicate with SPJ-, LQH- and main threads.
    * Cannot communicate with receive threads and other TC threads,
-   * but it can communicate with itself.
+   * but as SPJ is located together with TC, it is counted as it
+   * communicate with all TC threads.
    */
   tot += num_tc_threads *
-         (num_lqh_threads + num_main_threads + 1) *
+         (num_lqh_threads + num_main_threads + num_tc_threads) *
          job_queue_pages_per_thread;
 
   /**

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