== sanity test 255a: check 'lfs ladvise -a willread' ===== 17:47:36 (1751320056)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.542399 s, 193 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: 3.3665
Iter 1/10: OSS cache speed: 3.07477
Iter 1/10: ladvise speed: 3.7009
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 3.69018
Iter 2/10: OSS cache speed: 3.04663
Iter 2/10: ladvise speed: 3.1037
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.50742
Iter 3/10: OSS cache speed: 3.12747
Iter 3/10: ladvise speed: 3.00895
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 2.93271
Iter 4/10: OSS cache speed: 3.91037
Iter 4/10: ladvise speed: 4.62954
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.75915
Iter 5/10: OSS cache speed: 4.54202
Iter 5/10: ladvise speed: 3.4769
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 2.73965
Iter 6/10: OSS cache speed: 2.5112
Iter 6/10: ladvise speed: 2.58835
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 3.05547
Iter 7/10: OSS cache speed: 2.65502
Iter 7/10: ladvise speed: 2.77502
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.90267
Iter 8/10: OSS cache speed: 3.00716
Iter 8/10: ladvise speed: 3.45465
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 3.1415
Iter 9/10: OSS cache speed: 3.80799
Iter 9/10: ladvise speed: 2.8199
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.60803
Iter 10/10: OSS cache speed: 3.07721
Iter 10/10: ladvise speed: 2.87445
Average uncached read: 3.27
Average speedup with OSS cached read:  3.27 = +0%
Average speedup with ladvise willread:  3.24 = +-.91%
Speedup with OSS cached read less than 20%,  got 3.27%. Skipping ladvise willread check.