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Marking staging queue for flushing BID-HDD marks a staging queue for flushing whenever any of the timers ((wait(SQ_p)) or (deadline(SQ_p))) expires.
The staging queue for a process p is denoted by (SQ_p).
The staging queue for a process holds the requests which are ready to be sent to the dispatch queue of the device (based on block device driver specifications).
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In BID-HDD, the dynamically adaptable anticipation and the efficient pipelining of flushed requests from staging queues of processes are responsible for capitalizing the sequentiality, thereby reducing the disk arm movements.
Deadline timer for staging queue Use of wait timer alone can cause starvation, as staging queue (SQ_p) which always gets enqueued with request(s) before (wait(SQ_p)) expires will never be flushed.
Flushing I/O requests from staging queues to dispatch queue BID-HDD dequeues the I/O requests from staging queues and enqueues them to dispatch queue.
Per process staging queues (SQ_p) In order to segregate the I/O requests from each process, BID uses separate containers known as staging queues for each process.
The deadline of a staged queue (SQ_p) depends on the type of requests in the staging queue (SQ_p).
Once the staging queue (SQ_P) is marked for flushing, the tier placement and categorization decisions for the writes is performed.
The wait timer (wait(SQ_p)) value for a staging queue (SQ_p) is determined as follows: Whenever a set of requests (R_p) is enqueued to (SQ_p), the difference between the timestamp of newest request present in the (SQ_p) denoted by (TS_{new}(SQ_p)) and the time stamp of the oldest I/O request present in set (R_p) is computed.
Consider Fig. 9, amongst the I/O access requests for processes A, B, C, (staging; queue; SQ_C) is found to be an ideal candidate for tiering.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com