Java 7.0 and Java 7.1

By using the same workload and methodology that is described in Java servlet that uses JDBC and VSAM: CICS TS V5.2, the performance of Java 7.0 and Java 7.1 was compared. For both scenarios, CICS® TS 5.2 was used with Java 7.0 SR7 or Java 7.1 SR1.

Table 1 lists the performance measurements when running the workload with Java 7.0 SR7.

Note: APAR PI52819 enables support for Java 8 in CICS TS 5.2.

Table 1. Java 7.0 SR7 results for the Java servlet JDBC and VSAM workload
ETR	CICS CPU			CPU per request (ms)
ETR	Not zIIP-eligible	zIIP-eligible	Total	CPU per request (ms)
200	20.82%	29.42%	50.24%	2.512
400	42.34%	60.12%	102.46%	2.562
800	86.46%	120.38%	206.85%	2.586

Table 2 lists the performance measurements when running the workload with Java SR1.

Table 2. Java 7.1 SR1 results for the Java servlet JDBC and VSAM workload
ETR	CICS CPU			CPU per request (ms)
ETR	Not zIIP-eligible	zIIP-eligible	Total	CPU per request (ms)
200	21.44%	29.70%	51.15%	2.558
400	43.55%	61.13%	104.68%	2.617
800	88.95%	124.12%	213.07%	2.663

The performance measurements in Table 1 and Table 2 are shown in Figure 1.

Figure 1. Plot of Java 7.0 and Java 7.1 performance results for JDBC and VSAM workload

For this workload, Java 7.0 delivers slightly better performance than Java 7.1, which provides a decrease of approximately 2% in terms of CPU usage per transaction.

It can be observed that Java 7.1 provides the same linear scaling characteristics as demonstrated by the Java 7.0 run time.