== sanity test 255a: check 'lfs ladvise -a willread' ===== 18:38:14 (1736984294)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.639003 s, 164 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: 3.37988
Iter 1/10: OSS cache speed: 3.11641
Iter 1/10: ladvise speed: 3.24628
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 3.21786
Iter 2/10: OSS cache speed: 1.81381
Iter 2/10: ladvise speed: 2.01051
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 2.60381
Iter 3/10: OSS cache speed: 2.91089
Iter 3/10: ladvise speed: 2.26817
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 2.44375
Iter 4/10: OSS cache speed: 2.7312
Iter 4/10: ladvise speed: 2.37094
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 2.47093
Iter 5/10: OSS cache speed: 1.72934
Iter 5/10: ladvise speed: 1.34119
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 1.56494
Iter 6/10: OSS cache speed: 1.44803
Iter 6/10: ladvise speed: 1.28782
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 1.38474
Iter 7/10: OSS cache speed: 1.85537
Iter 7/10: ladvise speed: 1.82082
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 1.85599
Iter 8/10: OSS cache speed: 1.87569
Iter 8/10: ladvise speed: 1.92152
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 1.97061
Iter 9/10: OSS cache speed: 1.97418
Iter 9/10: ladvise speed: 2.29056
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.44
Iter 10/10: OSS cache speed: 2.16151
Iter 10/10: ladvise speed: 2.46022
Average uncached read: 2.33
Average speedup with OSS cached read:  2.16 = +-7.29%
Average speedup with ladvise willread:  2.10 = +-9.87%
Speedup with OSS cached read less than 20%,  got 2.16%. Skipping ladvise willread check.