== sanity test 255a: check 'lfs ladvise -a willread' ===== 10:44:49 (1736264689)
100+0 records in
100+0 records out
104857600 bytes (105 MB) copied, 0.552424 s, 190 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: 4.6872
Iter 1/10: OSS cache speed: 4.68272
Iter 1/10: ladvise speed: 5.37367
Iter 2/10: reading without willread hint
Iter 2/10: uncached speed: 5.30275
Iter 2/10: OSS cache speed: 5.39941
Iter 2/10: ladvise speed: 4.87747
Iter 3/10: reading without willread hint
Iter 3/10: uncached speed: 5.0332
Iter 3/10: OSS cache speed: 4.76477
Iter 3/10: ladvise speed: 5.21867
Iter 4/10: reading without willread hint
Iter 4/10: uncached speed: 4.56005
Iter 4/10: OSS cache speed: 5.00759
Iter 4/10: ladvise speed: 5.34626
Iter 5/10: reading without willread hint
Iter 5/10: uncached speed: 4.92204
Iter 5/10: OSS cache speed: 4.77523
Iter 5/10: ladvise speed: 4.85206
Iter 6/10: reading without willread hint
Iter 6/10: uncached speed: 4.97078
Iter 6/10: OSS cache speed: 4.80264
Iter 6/10: ladvise speed: 4.75016
Iter 7/10: reading without willread hint
Iter 7/10: uncached speed: 4.93933
Iter 7/10: OSS cache speed: 4.94553
Iter 7/10: ladvise speed: 4.8159
Iter 8/10: reading without willread hint
Iter 8/10: uncached speed: 4.72862
Iter 8/10: OSS cache speed: 5.23235
Iter 8/10: ladvise speed: 5.16731
Iter 9/10: reading without willread hint
Iter 9/10: uncached speed: 5.31396
Iter 9/10: OSS cache speed: 5.20111
Iter 9/10: ladvise speed: 4.88429
Iter 10/10: reading without willread hint
Iter 10/10: uncached speed: 5.30894
Iter 10/10: OSS cache speed: 4.98867
Iter 10/10: ladvise speed: 4.84354
Average uncached read: 4.97
Average speedup with OSS cached read:  4.98 = +.20%
Average speedup with ladvise willread:  5.01 = +.80%
Speedup with OSS cached read less than 20%,  got 4.98%. Skipping ladvise willread check.