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--- cluster:109 [2013/01/29 10:53]
hmeij
+++ cluster:109 [2013/02/02 15:30]
hmeij [Lammps GPU Testing (EC)]
@@ Line 2: / Line 2: @@
 **[[cluster:0|Back]]**
-===== Lammps GPU Testing =====
+===== Lammps GPU Testing (EC) =====
+  * 32 cores E2660
+  * 4 K20 GPU
+  * workstation
+  * MPICH2 flavor
+Same tests (12 cpu cores) using lj/cut, eam, lj/expand, and morse: **AU.reduced**
+    CPU only 6 mins 1 secs
+GPU 1 mins 1 secs (a 5-6 times speed up)
+GPUs 1 mins 0 secs (never saw 2nd GPU used, problem set too small?)
+Same tests (12 cpu cores) using a restart file and using gayberne: **GB**
+    CPU only 1 hour 5 mins
+GPU 5 mins and 15 secs (a 18-19 times peed up)
+GPUs 2 mins
+Above results seems overall a bit slower that at other vendor, but same pattern.
+Francis's Melt problem set
+^3d Lennard-Jones melt: for 10,000 steps with 32,000 atoms^^^^^^
+|CPU only|  -np 1  |  -np 6 | -np 12  |  -np 24  |  -np 36  |
+|loop times|  329s  |  63s  |  39s  |    29s  |  45s  |
+|GPU only|  1xK20  |  2xK20 |  3xK20  |  4xK20  |  (-np 1-4)  |
+|loop times|  28s  |  16s |  11s  |  10s  |    |
+^3d Lennard-Jones melt: for 100,000 steps with 32,000 atoms^^^^^^
+|GPU only|  1xK20  |  2xK20 |  3xK20  |  4xK20  |  (-np 1-4)  |
+|loop times|  274s  |  162s |  120s  |  98s  |    |
+  * Serial's time of 329s is reduced to 29s for MPI, an 11x speed up
+  * GPU's serial time matches MPI -np 24 and can be further reduced to 10s, a 3x speed up
+===== Lammps GPU Testing (MW) =====
 Vendor: "There are currently two systems available, each with two 8-core Xeon E5-2670 processors, 32GB memory, 120GB SSD and two Tesla K20 GPUs. The hostnames are master and node2.

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