== sanity test 255a: check 'lfs ladvise -a willread' ===== 10:47:09 (1760453229)
100+0 records in
100+0 records out
104857600 bytes (105 MB, 100 MiB) copied, 0.77476 s, 135 MB/s
ladvise: range [2, 1] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: range [2, 2] is invalid
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

ladvise: conflicting arguments of -l and -e
Provide servers with advice about access patterns for a file.
usage: ladvise [--advice|-a ADVICE] [--start|-s START[kMGT]]
               [--background|-b] [--unset|-u]

               {--end|-e END[kMGT]|--length|-l LENGTH[kMGT]}
               {[--mode|-m [READ,WRITE]}
               <file> ...

Synchronous ladvise should wait
fail_val=4
fail_loc=0x237
Asynchronous ladvise shouldn't wait
fail_loc=0
Iter 1/10: reading without willread hint
Iter 1/10: uncached speed: 4.21865
Iter 1/10: OSS cache speed: 4.22888
Iter 1/10: ladvise speed: 4.20449
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.1313
Iter 2/10: OSS cache speed: 4.27462
Iter 2/10: ladvise speed: 4.27262
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.22092
Iter 3/10: OSS cache speed: 4.37735
Iter 3/10: ladvise speed: 4.3093
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.05267
Iter 4/10: OSS cache speed: 4.06911
Iter 4/10: ladvise speed: 4.44036
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.78807
Iter 5/10: OSS cache speed: 4.76592
Iter 5/10: ladvise speed: 4.62617
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.10643
Iter 6/10: OSS cache speed: 4.8496
Iter 6/10: ladvise speed: 4.00405
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.20822
Iter 7/10: OSS cache speed: 3.9814
Iter 7/10: ladvise speed: 4.30974
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.2728
Iter 8/10: OSS cache speed: 4.36004
Iter 8/10: ladvise speed: 4.4807
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.41667
Iter 9/10: OSS cache speed: 4.43724
Iter 9/10: ladvise speed: 3.78686
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.79961
Iter 10/10: OSS cache speed: 4.21396
Iter 10/10: ladvise speed: 4.63712
Average uncached read: 4.32
Average speedup with OSS cached read:  4.35 = +.69%
Average speedup with ladvise willread:  4.30 = +-.46%
Speedup with OSS cached read less than 20%,  got 4.35%. Skipping ladvise willread check.