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Benchmarking Methodology and Performance Collection
Figure 6-1. Figure 1 Type
6.2
Expected Results and Demonstrated Value
The Ultrastar memory drive is designed to provide DRAM-like performance.
The Native system (with "all-DRAM" used and no software-defined memory) results
serve as a reference point and Ultrastar memory drive is expected to deliver at least
75% of that performance for fitting workloads (as described in Ultrastar memory drive
documentation).
In addition, it is common to review the overall demonstrated value-based price/
performance, enhanced capabilities and overall cost reduction/savings:
DRAM expansion by up to 8x.
DRAM-like performance (not more than 25% difference).
Memory cost reduction by 30-60%.
6.3
Performance Data Collection
Ultrastar memory drives provide tools for collecting performance-related statistics.
The tools are installed by default into /usr/local/{etc,bin}.
To activate periodic statistics data collection, use the following command in
Figure 6-1, which records the counters every 60 seconds into /tmp/stats. Note, it is
strongly recommended to ensure that this directory is neither network-based nor
ramfs/tmpfs, but rather a directory located on a direct-attached storage device.
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