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Transcoding Multimedia Video (CPU)

Storage Performance In Entertainment And Content Creation
By

Overall Statistics
Transcoding, CPU
Elapsed Time
05:27
Read Operations
144 375
Write Operations
5631
Data Read
15.98 GB
Data Written
410.58 MB
Disk Busy Time
39.72 s
Average Data Rate
422.40 MB/s


This is a repeat of the previous page, except that we're turning off the hardware acceleration and relying on software encoding (CPU only). Interestingly, we end up with a smaller file size. Whereas Quick Sync encoded four files totaling 713 MB, the CPU route results in 373 MB. 

We've been touting Quick Sync for the past year. It's clearly a feature that we enjoy. However, we also can't ignore that a vast many enthusiasts aren't running Sandy Bridge-based systems. Even if you do, you might not necessarily want to rely on MediaEspresso or another Quick Sync-enabled transcoding title. HandBrake, for example, remains a popular choice.

However, this trace establishes that, even when you rely on a software encoder, the storage characteristics of the workload don't change. That is to say manipulating multiple files at the same time queues I/O operations deeper.

I/O Trends:

  • 16% of all operations occur at a queue depth of one
  • 47% of all operations occur at queue depths between two and four
  • 33% of all operations occur at queue depths between five and eight
  • 84% of all data transferred is sequential
  • 89% of all operations occur are 128 KB in transfer size


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