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(a)
(b)
180
12,000
Harmony-60% tolerable SR
Harmony-40% tolerable SR
Eventual consistency
Strong consistency
160
140
120
100
80
60
40
20
0
0
10,000
8000
6000
4000
Harmony-60% tolerable SR
Harmony-40% tolerable SR
Eventual consistency
Strong consistency
2000
0
20
40 60
Client threads
80
100
0
20
40 60
Client threads
80
100
(c)
(d)
60,000
1.0
Harmony-60% tolerable SR
Harmony-40% tolerable SR
Eventual consistency
Strong consistency
50,000
0.8
40,000
0.6
30,000
0.4
20,000
0.2
10,000
0
0.0
0
20
40 60
Client threads
80
100
0
10
20 30
Network latency (ms)
40
50
FIGURE 10.4
Harmony with S% tolerable stale reads (Harmony-S% Tolerable SR) against strong and eventual consistency on Amazon EC2. (a) Shows
the 99th percentile latency of read operations, (b) shows the overall throughput for read and write operations, (c) shows the number of stale reads, and
(d) shows the impact of network latency on the stale reads estimation employed by Harmony.
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