== sanity test 255a: check 'lfs ladvise -a willread' ===== 10:06:04 (1736262364)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.525336 s, 200 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: 4.34774
Iter 1/10: OSS cache speed: 3.8564
Iter 1/10: ladvise speed: 4.62338
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.73907
Iter 2/10: OSS cache speed: 4.66096
Iter 2/10: ladvise speed: 4.56105
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.5948
Iter 3/10: OSS cache speed: 4.56377
Iter 3/10: ladvise speed: 4.60082
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.81289
Iter 4/10: OSS cache speed: 4.84437
Iter 4/10: ladvise speed: 4.68149
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.64053
Iter 5/10: OSS cache speed: 4.70397
Iter 5/10: ladvise speed: 4.46138
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.48397
Iter 6/10: OSS cache speed: 5.00281
Iter 6/10: ladvise speed: 5.25735
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.45999
Iter 7/10: OSS cache speed: 4.43513
Iter 7/10: ladvise speed: 5.21336
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 3.1263
Iter 8/10: OSS cache speed: 1.99073
Iter 8/10: ladvise speed: 3.17617
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.61544
Iter 9/10: OSS cache speed: 3.12376
Iter 9/10: ladvise speed: 4.53339
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.04378
Iter 10/10: OSS cache speed: 4.30526
Iter 10/10: ladvise speed: 4.18189
Average uncached read: 4.18
Average speedup with OSS cached read:  4.14 = +-.95%
Average speedup with ladvise willread:  4.52 = +8.13%
Speedup with OSS cached read less than 20%,  got 4.14%. Skipping ladvise willread check.