Minor changes

master
Eugen Betke 2018-10-25 18:24:49 +02:00
parent 478c272bb1
commit ad8241c262
3 changed files with 59 additions and 27 deletions

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@ -12,13 +12,15 @@
\usepackage{todonotes}
\newcommand{\jk}[1]{\todo[inline]{JK: #1}}
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@ -163,7 +165,7 @@ While providing many interfaces, the XPD does not offer a shared storage that ca
DDN provided access to their test cluster in D\"usseldorf on which 10 nodes could be used for testing.
Each node is equipped with two Sandy Bridge processors (8 cores, E5-2650v2 @2.60GHz) and 64~GB RAM.
They are interconnected with a Mellanox Connect-X-4 card providing 100 Gb/sec (4x EDR).
As storage, a DDN ES14K (Exascale 3.1) with two metadata servers and Lustre 2.7.19.12 is provided; additionally, an IME system consisting of 4 servers is provided.
As storage, a DDN ES14K (Exascale 3.1) with two metadata servers and Lustre \ebr{2.10.5}{2.7.19.12} is provided; additionally, an IME system consisting of 4 servers is provided.
The flash native data cache of IME acts as a burst buffer and is drained to the Lustre system, the performance reported with IOR is 85~GB/s in write mode.
The DDN IME provides byte-addressable flash-based storage space with high performance characteristics.
It can be addressed directly (IME-native) in a fast and efficient way, but DDN also provides a number of convenient solutions, that require less integration effort.
@ -235,7 +237,7 @@ Unless otherwise stated, the performance reported in this paper was measured wit
The goal of our evaluation is to systematically investigate the scaling behavior of the DDN IME's, IME-FUSE and Lustre.
In the following experiments we use 1-10 client nodes (NN) and 1-8 processes per node (PPN) to push hardware to the limits.
On each compute node only one CPU is used, that is connected directly to the Infiniband adapter, to avoid the QPI overhead.
On each compute node only one CPU is used, that is connected directly to the Infiniband adapter, to avoid the UPI overhead.
To provide reliable results, each experiment was repeated 10 times.
%\jk{Wie oft wurden die Experimente wiederholt steht nirgendwo?}
@ -354,6 +356,7 @@ This is probably caused by the FUSE overhead, which includes moving I/O requests
\subsection{Application Kernel Using HDF5}
\eb{Rerun NetCDF with larger files. NetCDF-Bench requires a stonewalling feature, like IOR. This would make benchmark runtime more predictable.}
\eb{Compilation of NetCDF with DDN-IME support.}
In this experiment, the HDF5 VOL development branch (date 2016-05-09), NetCDF~4.4.1 and NetCDF-bench is used.
%Several values for the 4D data geometry (($100$:$16$:$64$:$4$) $\approx$ 3.1MiB, ($100$:$16$:$64$:$25$) $\approx$ 19.5iB, ($100$:$16$:$64$:$256$) $\approx$ 200MiB, ($100$:$16$:$64$:$2560$) $\approx$ 2000MiB) of raw integer data have been explored.
Several values for the 4D data geometry of raw integer data have been explored.