== sanity test 255a: check 'lfs ladvise -a willread' ===== 11:33:25 (1737131605)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.535923 s, 196 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: 4.56489
Iter 1/10: OSS cache speed: 4.71953
Iter 1/10: ladvise speed: 4.81772
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 4.71705
Iter 2/10: OSS cache speed: 4.33021
Iter 2/10: ladvise speed: 4.46196
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 4.62755
Iter 3/10: OSS cache speed: 4.50964
Iter 3/10: ladvise speed: 4.46564
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.69661
Iter 4/10: OSS cache speed: 4.62807
Iter 4/10: ladvise speed: 4.52224
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.50069
Iter 5/10: OSS cache speed: 4.49499
Iter 5/10: ladvise speed: 4.50446
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 3.98237
Iter 6/10: OSS cache speed: 4.31774
Iter 6/10: ladvise speed: 4.51515
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.44214
Iter 7/10: OSS cache speed: 4.63358
Iter 7/10: ladvise speed: 4.56036
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.49968
Iter 8/10: OSS cache speed: 4.61067
Iter 8/10: ladvise speed: 4.79216
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 3.98365
Iter 9/10: OSS cache speed: 3.76652
Iter 9/10: ladvise speed: 4.80999
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 4.49431
Iter 10/10: OSS cache speed: 4.83831
Iter 10/10: ladvise speed: 4.67394
Average uncached read: 4.45
Average speedup with OSS cached read:  4.48 = +.67%
Average speedup with ladvise willread:  4.61 = +3.59%
Speedup with OSS cached read less than 20%,  got 4.48%. Skipping ladvise willread check.