== sanity test 255a: check 'lfs ladvise -a willread' ===== 11:09:25 (1730822965)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.632922 s, 166 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: 5.63889
Iter 1/10: OSS cache speed: 6.49757
Iter 1/10: ladvise speed: 6.53034
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 5.38908
Iter 2/10: OSS cache speed: 5.44737
Iter 2/10: ladvise speed: 6.34353
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 5.07094
Iter 3/10: OSS cache speed: 5.49704
Iter 3/10: ladvise speed: 5.84659
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 5.11121
Iter 4/10: OSS cache speed: 5.97881
Iter 4/10: ladvise speed: 5.80518
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 5.29947
Iter 5/10: OSS cache speed: 6.14931
Iter 5/10: ladvise speed: 5.57087
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.93799
Iter 6/10: OSS cache speed: 5.52103
Iter 6/10: ladvise speed: 5.29505
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 5.03303
Iter 7/10: OSS cache speed: 5.51028
Iter 7/10: ladvise speed: 6.01791
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 5.19134
Iter 8/10: OSS cache speed: 5.52976
Iter 8/10: ladvise speed: 5.52434
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 4.67219
Iter 9/10: OSS cache speed: 6.09526
Iter 9/10: ladvise speed: 6.13818
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.29813
Iter 10/10: OSS cache speed: 5.7703
Iter 10/10: ladvise speed: 5.28444
Average uncached read: 5.16
Average speedup with OSS cached read:  5.79 = +12.20%
Average speedup with ladvise willread:  5.83 = +12.98%
Speedup with OSS cached read less than 20%,  got 5.79%. Skipping ladvise willread check.