Changes between Version 19 and Version 20 of AppMultiThread

Timestamp:

Apr 1, 2008, 3:35:16 PM (16 years ago)

Author:

davea

Comment:

--

AppMultiThread

@@ -1 +1 @@
 = API for multi-thread apps =
-
-[[T(DesignDocument)]]
 
 == Why write a multi-threaded app? ==
@@ -25 +23 @@
 
 Suppose you've developed a multi-threaded program,
-and that it achieves a linear speedup on up to 16 processors, and no additional speedup beyond that.
+and that it achieves a linear speedup on up to 64 processors, and no additional speedup beyond that.
 To deploy it:
 
@@ -33 +31 @@
 {{{
 bool app_plan(SCHEDULER_REQUEST& sreq, const char* plan_class, HOST_USAGE& hu) {
-    if (!strcmp(plan_class, "par16")) {
-        if (host.ncpus < 16) {
-            hu.ncpus = sreq.host.ncpus;
-            hu.flops = sreq.host.p_fpops*sreq.host.p_ncpus;
-        } else {
-            hu.ncpus = 16;
-            hu.flops = sreq.host.p_fpops*16;
-        }
+    // clients before 6.1.11 don't understand plan_class
+    //
+    int v = sreq.core_client_major_version*10000
+        + sreq.core_client_minor_version*100
+        + sreq.core_client_release;
+    if (v < 60111) return false;
+
+    if (!strcmp(plan_class, "par64")) {
+        int ncpus, nthreads;
+        bool bounded;
+
+        get_ncpus(sreq, ncpus, bounded);
+        nthreads = ncpus;
+        if (nthreads > 64) nthreads = 64;
+        hu.avg_ncpus = nthreads;
+        hu.max_ncpus = nthreads;
+        sprintf(hu.cmdline, "--nthreads %d", nthreads);
+        hu.flops = 0.95*sreq.host.p_fpops*nthreads;
         return true;
+
     }
     return false;