JP2013041547A5 - - Google Patents

Description

SNIA, Solid State Storage Performance Test Specification http://www.snia.org/ An overview of SYSmark (TM) 2007 Preview http://www.bapco.com/support/technical_documents/SYSmark2007Preview_WhitePaper.pdf PCMark Vantage Whitepaper v1.0http: //www.futuremark.com/pressroom/companypdfs/PCMark_Vantage_Whitepaper_v1.0_ (PDF)? M = v PCMark05 Whitepaper v1.0http: //www.futuremark.com/pressroom/companypdfs/PCMark05_Whitepaper_1_0.pdf? M = v IOmeter User ’s Guidehttp: //www.iometer.org/doc/downloads.html Samsung SSD Magician USER GUIDEhttp: //www.samsungssd.com/faq CrystalDiskMark Manual http://crystalmark.info/software/CrystalDiskMark/manual-en/http://crystalmark.info/software/CrystalDiskMark/manual-en/ Software for monitoring the speed of external storage devices http://www.forest.impress.co.jp/docs/review/20100222_350600.htmlhttp://hansolav.net/gadgets/drivemeter/ ATA / ATAPI Command Set-2 (ACS-2) d2015r6 Feb.22.2011http: //www.t13.org/Documents/UploadedDocuments/docs2011/d2015r6-ATAATAPI_Command_Set_-_2_ACS-2.pdf ・ Pages 98-99, Page 50: Data Set Management Command (Trim command) • Pages 342 to 365: SCT Command Transport • Pages 218 to 219, pages 324 to 325: Read FPDMA QUEUED / WRITE FPDMA QUEUED

When the host 100 issues a read request or a write request to the SSD 10, the host 100 inputs an LBA (Logical Block Addressing) as a logical address via the ATA interface 90. LBA is a logical address in which a serial number from 0 is assigned to a logical sector (size: eg, 512 B). Further, when issuing a read request or a write request to the SSD 10, the host 100 inputs a sector size that is a target of the read request or the write request together with the LBA.

As shown in FIG. 11, LBA is a logical address in which a serial number from 0 is assigned to a sector (size: for example, 512 B). In the present embodiment, the management unit of the logical address (LBA) of the SSD 10 is a cluster address composed of a bit string higher than the lower (s + 1) bit of the LBA and a bit string higher than the lower (s + t + 1) bit of the LBA. Define the track address to be configured. That is, the logical sector is a minimum access unit from the host 100. The cluster is a management unit for managing “small data” in the SSD, and is determined so that a natural number multiple of the sector size becomes the cluster size. A track is a management unit for managing “large data” inside the SSD, and is determined so that a natural number multiple of 2 or more of the cluster size is the track size. Therefore, the track address is the LBA divided by the track size, the in-track address is the remainder of dividing the LBA by the track size, the cluster address is the LBA divided by the cluster size, and the in-cluster address is LBA Is the remainder of dividing by the cluster size. In the following description, for the sake of convenience, the track size is assumed to be equal to the size of data that can be recorded in one physical block (if the physical block includes redundant bits for error correction performed by the ECC circuit 58, the size is excluded). The size of the cluster is equal to the size of data that can be recorded on one physical page (if the physical page includes redundant bits for error correction performed by the ECC circuit 58, the size is excluded).

The command direction information is information on whether it is a command to the SSD 10 (request transmission) or a response from the SSD 10 (completion notification). For example, in the case of the SATA standard, when the Register Host to Device (RegHD) of the 60h READ FPDMA QUEUED command is transmitted from the host 100 to the SSD 10 in the 60h READ FPDMA QUEUED command described in INCITS ACS-2, as an instruction (request transmission) When the log is received from the OS 150 and the Set Device Bits (SDB) of the 60h READ FPDMA QUEUED command is received from the SSD 10, the completion notification log is received from the OS 150 as the completion of the command. Also, in the 61h WRITE FPDMA QUEUED command of the SATA standard, when RegHD of the 61h WRITE FPDMA QUEUED command is transmitted from the host 100 to the SSD 10, the log is received from the OS 150 as an instruction (request transmission), and the SDB of the 61h WRITE FPDMA QUEUED command is received. When received from the SSD 10, a completion notification log is received from the OS 150 as the completion of the command. Except for abnormal times when the command does not end, the command always has a command (request transmission) and response (completion notification) pair. The request transmission indicates the command start and the response (completion notification) indicates the command end. Is the time required to execute the command.

Next, a procedure for calculating a transfer data rate as performance information will be described with reference to FIG. When the calculation start is triggered, the performance information acquisition tool 112 reads the access log table 120 (step S250). Performance information acquisition tool 112, based on the time information recorded in the access log table 120, between the time tn-1 at a single thread (in this case a thread Q 0) at time tn, inactive The total δn of the time δ is acquired (step S251). Next, the performance information acquisition tool 112 subtracts the start time tn-1 of the performance measurement target period from the end time tn of the performance measurement target period to obtain the performance measurement target period Δtn, and further inactive from the performance measurement target period Δtn. The total time δn is subtracted to obtain the effective performance measurement target period Δtn ′ (= Δtn−δn) (step S252).

Next, the performance information acquisition tool 112 acquires a list of commands of the thread Q 0 started and completed between the time tn-1 and the time tn based on the record information of the access log table 120, and The total data amount (= S0) is calculated by adding the data lengths (step S253). The performance information acquisition tool 112 starts from the time tn-2 which is the previous cycle to the time tn-1 and starts from the time tn-1 which is the current cycle, based on the recorded information in the access log table 120. Obtain a list of commands of thread Q 0 completed during time tn, calculate the contribution to the current period of each command in the same manner as described above, and multiply each contribution by the amount of data of each command. The sum (= S1) is calculated (step S254). Next, the performance information acquisition tool 112 starts from the time tn-1 which is the current cycle to the time tn based on the recorded information in the access log table 120, and starts from the time tn which is the next cycle to the time tn +. For the command of thread Q 0 completed during 1, the same calculation is performed to calculate the contribution, and the sum (= S2) of each contribution multiplied by the data amount of each command is calculated (step S2). S255). Furthermore, the performance information acquisition tool 112 calculates the transfer data rate of the current cycle in the thread Q 0 according to the following equation (step S256).
Transfer data rate = (S0 + S1 + S2) / Δtn ′
Such processing is repeatedly executed for each thread.

Claims (17)

In an information processing apparatus comprising a host device on which a performance evaluation tool is mounted, an external storage device having a readable and writable nonvolatile memory, and an interface unit that connects the host device and the external storage device,
The performance evaluation tool is:
A command other than the OS or the performance evaluation tool installed in the host device normally accesses the external storage device, a command including a response, and time information related to the command are acquired from the OS and used as an access log. An access log acquisition unit for sequentially recording;
Using the time information included in the access log, the effective time information excluding the time when the command to the external storage device is inactive is calculated, and the access log recorded by the access log acquisition unit and the execution time information are used. A performance log acquisition unit that calculates performance information of the external storage device and records the calculation result as a performance information log;
An information processing apparatus comprising: The host device employs a multi-thread method in which a plurality of threads can operate in parallel .
The performance log acquisition unit calculates the performance information using effective time information excluding the time when the command is inactive in all threads when calculating the performance information by combining a plurality of threads. The information processing apparatus according to claim 1 . The host device employs a multi-thread method in which a plurality of threads can operate in parallel .
When calculating performance information for each thread, the performance log acquisition unit calculates the performance information using effective time information excluding the time when the command to the external storage device is inactive in the thread. The information processing apparatus according to claim 1 or 2 . The access log acquisition unit has an access log table for recording the access log,
It said performance log acquisition unit, the information processing apparatus according to any one of claims 1 to 3, characterized in that it has a performance log table for recording the performance information log. The access log, the start time of the command, time information indicating the end time, the command contents, the information processing apparatus according to any one of claims 1 to 4, characterized in that it comprises a data length. The information processing apparatus according to any one of 1 to 5 , wherein the performance information log includes at least one of a transfer data rate, a processing command rate, a response time, and a processing time. When the performance information stored in the performance information log is out of the allowable range, the performance log acquisition unit performs an optimization process for returning the performance of the external storage device to the allowable range with respect to the external storage device. the information processing apparatus according to any one of claims 1 to 6, wherein. The nonvolatile memory of the external storage device is a nonvolatile semiconductor memory in which reading and writing are performed in page units and erasing is performed in block units larger than the page units,
The information processing apparatus according to claim 7 , wherein the optimization process is to notify the external storage device of a deletion notification for a logical address of the external storage device that does not hold data. The information processing apparatus according to claim 7 , wherein the optimization process is to execute a defragmentation process on the OS using a discontinuous logical address area of the external storage device as a continuous address area . The nonvolatile memory of the external storage device is a nonvolatile semiconductor memory in which reading and writing are performed in page units and erasing is performed in block units larger than the page units,
The information processing apparatus according to claim 7 , wherein the optimization process is to notify the external storage device of an instruction for executing data reduction of the nonvolatile semiconductor memory to increase unused blocks. The non-volatile memory of the external storage device is a non-volatile semiconductor memory that is read and written in page units and erased in block units larger than the page units, and the external storage device is predetermined from the host device. When there is no period access, the data reduction of the nonvolatile semiconductor memory is executed to increase unused blocks,
The information processing apparatus according to claim 7 , wherein the optimization process is to prohibit software other than the OS or the performance evaluation tool from accessing the nonvolatile memory of the external storage device for a predetermined period. The performance log acquisition unit monitors the CPU usage rate of the host device by the access log acquisition unit. When the CPU usage rate exceeds a first threshold, the access log acquisition unit unloads the access log acquisition unit. after, the CPU usage is below the threshold value smaller than the second threshold value, the information processing apparatus according to any one of claims 1 to 11, characterized in that loading the access log acquisition unit. Said performance log acquisition unit, the information processing apparatus according to any one of claims 1 to 11, characterized in that to perform unloading of the access log acquisition unit, a load periodically. In a performance evaluation tool that is mounted on a host device connected to an external storage device having a readable and writable nonvolatile memory and evaluates the performance of the external storage device,
A command other than the OS or the performance evaluation tool installed in the host device normally accesses the external storage device, a command including a response, a command including a response, and time information regarding the command are acquired from the OS, and an access log An access log acquisition unit that sequentially records as:
Using the time information included in the access log, the effective time information excluding the time when the command to the external storage device is inactive is calculated, and the access log recorded by the access log acquisition unit and the execution time information are used. A performance log acquisition unit that calculates performance information of the external storage device and records the calculation result as a performance information log;
A performance evaluation tool characterized by comprising: The host device employs a multi-thread method in which a plurality of threads can operate in parallel .
The performance log acquisition unit calculates the performance information using effective time information excluding the time when the command is inactive in all threads when calculating the performance information by combining a plurality of threads. The performance evaluation tool according to claim 14 . The host device employs a multi-thread method in which a plurality of threads can operate in parallel .
When calculating performance information for each thread, the performance log acquisition unit calculates the performance information using effective time information excluding the time when the command to the external storage device is inactive in the thread. The performance evaluation tool according to claim 14 or 15 . In a performance evaluation method for evaluating the performance of an external storage device connected to a host device via an interface and having a readable and writable nonvolatile memory,
A command other than the OS or the performance evaluation tool installed in the host device normally accesses the external storage device, a command including a response, a command including a response, and time information regarding the command are acquired from the OS, and an access log Record sequentially as
The effective time information excluding the time when the command to the external storage device is inactive is calculated using the time information included in the access log, and the external storage is used using the recorded access log and the execution time information. A method for evaluating the performance of an external storage device, comprising: calculating device performance information and recording the calculation result as a performance information log.