== sanity test 255a: check 'lfs ladvise -a willread' ===== 07:08:53 (1747825733)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.65648 s, 160 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: 5.15467
Iter 1/10: OSS cache speed: 4.56064
Iter 1/10: ladvise speed: 5.7853
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.84601
Iter 2/10: OSS cache speed: 7.12252
Iter 2/10: ladvise speed: 6.67253
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.83847
Iter 3/10: OSS cache speed: 6.23406
Iter 3/10: ladvise speed: 6.58819
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.84454
Iter 4/10: OSS cache speed: 5.30694
Iter 4/10: ladvise speed: 4.55254
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.46624
Iter 5/10: OSS cache speed: 6.42475
Iter 5/10: ladvise speed: 6.41303
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 5.81328
Iter 6/10: OSS cache speed: 6.72626
Iter 6/10: ladvise speed: 7.14328
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.31169
Iter 7/10: OSS cache speed: 4.76095
Iter 7/10: ladvise speed: 4.44773
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 3.96793
Iter 8/10: OSS cache speed: 4.92826
Iter 8/10: ladvise speed: 6.05458
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 5.00338
Iter 9/10: OSS cache speed: 6.99597
Iter 9/10: ladvise speed: 6.79451
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.51622
Iter 10/10: OSS cache speed: 7.12262
Iter 10/10: ladvise speed: 6.80934
Average uncached read: 4.87
Average speedup with OSS cached read:  6.01 = +23.40%
Average speedup with ladvise willread:  6.12 = +25.66%
Speedup with OSS cached read less than 20%,  got 6.01%. Skipping ladvise willread check.