== sanity test 255a: check 'lfs ladvise -a willread' ===== 23:28:42 (1722482922)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.60688 s, 173 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: 3.13857
Iter 1/10: OSS cache speed: 3.34254
Iter 1/10: ladvise speed: 3.48996
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 2.78678
Iter 2/10: OSS cache speed: 3.29755
Iter 2/10: ladvise speed: 3.32967
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 3.20608
Iter 3/10: OSS cache speed: 3.48505
Iter 3/10: ladvise speed: 3.3307
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 2.90673
Iter 4/10: OSS cache speed: 3.21717
Iter 4/10: ladvise speed: 3.38732
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 2.94516
Iter 5/10: OSS cache speed: 3.4842
Iter 5/10: ladvise speed: 3.23825
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 2.55037
Iter 6/10: OSS cache speed: 3.02831
Iter 6/10: ladvise speed: 3.6052
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 2.91317
Iter 7/10: OSS cache speed: 3.17489
Iter 7/10: ladvise speed: 3.41506
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 2.66588
Iter 8/10: OSS cache speed: 3.27863
Iter 8/10: ladvise speed: 2.99232
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 2.78401
Iter 9/10: OSS cache speed: 3.08827
Iter 9/10: ladvise speed: 3.16391
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 2.69192
Iter 10/10: OSS cache speed: 3.05256
Iter 10/10: ladvise speed: 3.10874
Average uncached read: 2.85
Average speedup with OSS cached read:  3.24 = +13.68%
Average speedup with ladvise willread:  3.30 = +15.78%
Speedup with OSS cached read less than 20%,  got 3.24%. Skipping ladvise willread check.