== sanity test 255a: check 'lfs ladvise -a willread' ===== 18:26:58 (1736983618)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.795162 s, 132 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: 2.50516
Iter 1/10: OSS cache speed: 3.12955
Iter 1/10: ladvise speed: 3.36643
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.66509
Iter 2/10: OSS cache speed: 2.92238
Iter 2/10: ladvise speed: 3.20752
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 2.89893
Iter 3/10: OSS cache speed: 4.30845
Iter 3/10: ladvise speed: 4.474
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 3.14621
Iter 4/10: OSS cache speed: 3.80904
Iter 4/10: ladvise speed: 3.42144
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 2.45051
Iter 5/10: OSS cache speed: 3.33066
Iter 5/10: ladvise speed: 3.78217
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 2.69481
Iter 6/10: OSS cache speed: 3.47924
Iter 6/10: ladvise speed: 3.9803
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 3.20997
Iter 7/10: OSS cache speed: 3.49886
Iter 7/10: ladvise speed: 4.03224
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 3.55111
Iter 8/10: OSS cache speed: 4.32681
Iter 8/10: ladvise speed: 3.98591
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.0968
Iter 9/10: OSS cache speed: 3.84357
Iter 9/10: ladvise speed: 2.23652
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.06454
Iter 10/10: OSS cache speed: 3.10473
Iter 10/10: ladvise speed: 4.16787
Average uncached read: 2.92
Average speedup with OSS cached read:  3.57 = +22.26%
Average speedup with ladvise willread:  3.66 = +25.34%
Speedup with OSS cached read less than 20%,  got 3.57%. Skipping ladvise willread check.