== sanity test 255a: check 'lfs ladvise -a willread' ===== 08:16:56 (1721218616)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.625243 s, 168 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: 3.25665
Iter 1/10: OSS cache speed: 3.49929
Iter 1/10: ladvise speed: 3.66307
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 3.06552
Iter 2/10: OSS cache speed: 3.92654
Iter 2/10: ladvise speed: 6.05723
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.14421
Iter 3/10: OSS cache speed: 3.56518
Iter 3/10: ladvise speed: 3.46958
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 3.02739
Iter 4/10: OSS cache speed: 3.24127
Iter 4/10: ladvise speed: 3.57473
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 2.63172
Iter 5/10: OSS cache speed: 3.27758
Iter 5/10: ladvise speed: 3.20279
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 2.8661
Iter 6/10: OSS cache speed: 3.23968
Iter 6/10: ladvise speed: 4.03755
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 3.19728
Iter 7/10: OSS cache speed: 3.44809
Iter 7/10: ladvise speed: 3.22779
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.74271
Iter 8/10: OSS cache speed: 3.32997
Iter 8/10: ladvise speed: 3.21496
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.78348
Iter 9/10: OSS cache speed: 3.58123
Iter 9/10: ladvise speed: 3.55047
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.86992
Iter 10/10: OSS cache speed: 3.23892
Iter 10/10: ladvise speed: 3.17219
Average uncached read: 2.95
Average speedup with OSS cached read:  3.43 = +16.27%
Average speedup with ladvise willread:  3.71 = +25.76%
Speedup with OSS cached read less than 20%,  got 3.43%. Skipping ladvise willread check.