What's the difference between Load and Stress testing ?
Answer Posted / sailaja
One of the most common, but unfortunate misuse of
terminology is treating "load testing" and "stress testing"
as synonymous. The consequence of this ignorant semantic
abuse is usually that the system is neither properly "load
tested" nor subjected to a meaningful stress test.
1. Stress testing is subjecting a system to an unreasonable
load while denying it the resources (e.g., RAM, disc, mips,
interrupts, etc.) needed to process that load. The idea is
to stress a system to the breaking point in order to find
bugs that will make that break potentially harmful. The
system is not expected to process the overload without
adequate resources, but to behave (e.g., fail) in a decent
manner (e.g., not corrupting or losing data). Bugs and
failure modes discovered under stress testing may or may
not be repaired depending on the application, the failure
mode, consequences, etc. The load (incoming transaction
stream) in stress testing is often deliberately distorted
so as to force the system into resource depletion.
2. Load testing is subjecting a system to a statistically
representative (usually) load. The two main reasons for
using such loads is in support of software reliability
testing and in performance testing. The term "load testing"
by itself is too vague and imprecise to warrant use. For
example, do you mean representative
load," "overload," "high load," etc. In performance
testing, load is varied from a minimum (zero) to the
maximum level the system can sustain without running out of
resources or having, transactions suffer (application-
specific) excessive delay.
3. A third use of the term is as a test whose objective is
to determine the maximum sustainable load the system can
handle. In this usage, "load testing" is merely testing at
the highest transaction arrival rate in performance testing
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