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IOshark is a repeatable application workload storage benchmark. You
can find more documentation on IOshark at :
https://docs.google.com/a/google.com/document/d/1Bhq7iNPVc_JzwRrkmZqcPjMvWgpHX0r3Ncq-ZsRNOBA/edit?usp=sharing
The short summary of what IOshark is : IOshark has 2 components, one
is a strace+ftrace compiler that takes straces and select ftraces fed
into it and compiles this into bytecodes (stored in *.wl files). The
compiler runs on a Linux host. The second component (which runs on the
device) is the tester that takes as input the bytecode files (*.wl
files) and executes them on the device.
How to Run :
----------
- First collect straces and compile these into bytecodes. The wrapper
script provided (collect-straces.sh) collects straces, ships them to
the host where the script runs, compiles and packages up the bytecode
files into a wl.tar file.
- Ship the wl.tar file and the iostark_bench binaries to the target
device (on /data/local/tmp say). Explode the tarfile.
- Run the tester. "ioshark_bench *.wl" runs the test with default
options. Supported ioshark_bench options :
-b : Explicitly specify a blockdev (to get IO stats from from
/proc/diskstats).
-d : Preserve the delays between successive filesystem syscalls as
seen in the original straces.
-n <N> : Run for N iterations
-t <N> : Limit to N threads. By default (without this option), IOshark
will launch as many threads as there are input files, so 1 thread/file.
-v : verbose. Chatty mode.
-s : One line summary.
-q : Don't create the files in read-only partitions like /system and
/vendor. Instead do reads on those files.
FILE FORMAT :
-----------
Each IOshark workload file is composed of the following
Header
File State : Table of File Entries. Each entry describes a file
File Op : Table of File Operations. One entry describes one operation
Each of the above is described below :
Note : Everything is in Big Endian byte order.
Header {
/* IOshark version number */
u_int64_t ioshark_version;
/* Total number of files used in this IOshark workload file */
u_int64_t num_files;
/* Total number of IO operations in this IOshark workload file */
u_int64_t num_io_operations;
}
File State {
u_int64_t fileno;
u_int64_t size;
u_int64_t global_filename_ix;
}
File Op {
/* delta us between previous file op and this */
u_int64_t delta_us;
#define file_op file_op_union.file_op_u
union {
enum file_op file_op_u;
int32_t enum_size;
} file_op_union;
u_int64_t fileno;
union {
struct lseek_args {
#define lseek_offset u.lseek_a.offset
#define lseek_action u.lseek_a.action
u_int64_t offset;
int32_t action;
} lseek_a;
struct prw_args {
#define prw_offset u.prw_a.offset
#define prw_len u.prw_a.len
u_int64_t offset;
u_int64_t len;
} prw_a;
#define rw_len u.rw_a.len
struct rw_args {
u_int64_t len;
} rw_a;
#define mmap_offset u.mmap_a.offset
#define mmap_len u.mmap_a.len
#define mmap_prot u.mmap_a.prot
struct mmap_args {
u_int64_t offset;
u_int64_t len;
int32_t prot;
} mmap_a;
#define open_flags u.open_a.flags
#define open_mode u.open_a.mode
struct open_args {
int32_t flags;
int32_t mode;
} open_a;
} u;
}
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