== sanity test 255a: check 'lfs ladvise -a willread' ===== 17:17:53 (1713388673)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.711032 s, 147 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: 3.57217
Iter 1/10: OSS cache speed: 3.37412
Iter 1/10: ladvise speed: 3.35702
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.91319
Iter 2/10: OSS cache speed: 5.04661
Iter 2/10: ladvise speed: 5.90112
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.65381
Iter 3/10: OSS cache speed: 3.95172
Iter 3/10: ladvise speed: 3.4062
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 2.88727
Iter 4/10: OSS cache speed: 3.52436
Iter 4/10: ladvise speed: 3.57509
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 3.57514
Iter 5/10: OSS cache speed: 4.24844
Iter 5/10: ladvise speed: 3.71086
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 3.45069
Iter 6/10: OSS cache speed: 3.70006
Iter 6/10: ladvise speed: 3.71549
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 3.23408
Iter 7/10: OSS cache speed: 3.86046
Iter 7/10: ladvise speed: 4.12986
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 3.10758
Iter 8/10: OSS cache speed: 3.6132
Iter 8/10: ladvise speed: 3.47809
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 3.5019
Iter 9/10: OSS cache speed: 5.09594
Iter 9/10: ladvise speed: 4.3548
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.00098
Iter 10/10: OSS cache speed: 4.35272
Iter 10/10: ladvise speed: 4.58226
Average uncached read: 3.38
Average speedup with OSS cached read:  4.07 = +20.41%
Average speedup with ladvise willread:  4.02 = +18.93%
Speedup with OSS cached read less than 20%,  got 4.07%. Skipping ladvise willread check.